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Can a fuel pump cause a no start condition?

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Can a fuel pump cause a no start condition?

CASE 1: If your fuel pressure gauge read 50 PSI or more as the engine cranked. This means that the fuel pump on your 4.3L, 5.0L, or 5.7L is OK and not the cause of your No Start Condition. The next step is to observe the fuel pressure gauge’s needle (after your helper stopped cranking the engine).

How can I tell if my fuel pump relay is faulty?

2. Engine does not start. Another symptom of a faulty fuel pump relay is an engine that does not start. If the fuel pump relay fails the fuel pump will be left without power. The engine may still crank when the key is turned, however it will not be able to start due to lack of fuel.

What happens if your fuel pump is weak?

A weak fuel pump may still pump fuel, but the vehicle may experience difficulty starting from the lack of pressure. A weakened fuel pump can cause the vehicle to take more cranks to start than normal, and in more serious cases may even cause the vehicle to require multiple turns of the key before it will start. 3.

Why does my fuel pump not prime with the key on?

Fuel pump doesn’t prime with key on. I’ve been trying to figure this out for a couple days now. My 01 Tiburon wouldn’t start the other day. It would crank, but wouldn’t fire. When I turn the key to the “on” position, the fuel pump doesn’t kick on.

Can a weak fuel pump cause a car to not start?

A weak fuel pump may still pump fuel, but the vehicle may experience difficulty starting from the lack of pressure. A weakened fuel pump can cause the vehicle to take more cranks to start than normal, and in more serious cases may even cause the vehicle to require multiple turns of the key before it will start.

Why does my 1997 Chevy c1500 not start?

1997 Chevy C1500, 2WD, 5.7L won’t start – cranks fine. No codes – good fuel pressure ( 60+ psi – new pump), good spark, 1997 Chevy C1500, 2WD, 5.7L wont start – cranks fine. No… It will not start. I changed the fuel filter and fuel pump It will not start. I changed the fuel filter and fuel pump relay.

Fuel pump doesn’t prime with key on. I’ve been trying to figure this out for a couple days now. My 01 Tiburon wouldn’t start the other day. It would crank, but wouldn’t fire. When I turn the key to the “on” position, the fuel pump doesn’t kick on.

How can you tell if your fuel pump is bad?

One of the surest indicators of a faulty fuel pump is a sputtering engine — typically at high speeds. Should you be driving at a consistently high speed and the engine suddenly sputter before returning to normal operation, it may indicate issues within the fuel pump.

How to check no fuel condition on GM 4.3L?

I’ve also included how to check a no fuel condition with starting fluid (although this is not the most effective way to test the fuel pump). It’s been my experience that misdiagnosing a bad fuel pump is a common occurrence on the 4.3L, 5.0L, 5.7L GM vehicles with the ‘Spider’ fuel injector assembly.

What should fuel pressure be on GM 4.3L Vortec?

You can find this tutorial in Spanish here: Cómo Probar La Bomba de Combustible (GM 4.3L, 5.0L, 5.7L) (at: autotecnico-online.com ). The fuel system in your 4.3L, 5.0L, or 5.7L Vortec engine needs at least 50 PSI of fuel pressure to start.

What should the fuel pump pressure be to start the engine?

The fuel pump produces much more than just 50 PSI of course but the bare minimum the engine needs to start is 50 PSI. Anything less and it will crank for ever before it starts or not start at all. So, the very first thing you need to do is to verify that the fuel pump is delivering at least 50 PSI of fuel pressure while the engine is cranking.

When do you need a S10 fuel pump?

If you notice sudden jolting on acceleration, fuel economy changes or ignition failure, there’s a good chance you need a new Chevrolet S10 fuel pump from AutoZone. Since S10 fuel pumps provide the engine with a steady supply of fuel on demand when you accelerate, they start to affect vehicle performance quickly when something goes wrong.

CASE 1: If your fuel pressure gauge read 50 PSI or more as the engine cranked. This means that the fuel pump on your 4.3L, 5.0L, or 5.7L is OK and not the cause of your No Start Condition. The next step is to observe the fuel pressure gauge’s needle (after your helper stopped cranking the engine).

I’ve also included how to check a no fuel condition with starting fluid (although this is not the most effective way to test the fuel pump). It’s been my experience that misdiagnosing a bad fuel pump is a common occurrence on the 4.3L, 5.0L, 5.7L GM vehicles with the ‘Spider’ fuel injector assembly.

You can find this tutorial in Spanish here: Cómo Probar La Bomba de Combustible (GM 4.3L, 5.0L, 5.7L) (at: autotecnico-online.com ). The fuel system in your 4.3L, 5.0L, or 5.7L Vortec engine needs at least 50 PSI of fuel pressure to start.

What should fuel pressure be if fuel pump is not activating?

If the fuel pump relay IS NOT activating the fuel pump, the fuel pressure test gauge will register 0 PSI when cranking the engine. If the fuel pump relay is activating the fuel pump, then it’ll register about 56-62 PSI even if the engine does not start. Any fuel pressure below 50 PSI and the engine will NOT start.

How to troubleshoot a GM fuel pump relay?

The following tutorial may be of help: Troubleshooting The Fuel Pump (GM 4.3L, 5.0L, 5.7L) (at: troubleshootmyvehicle.com ). The following links will help you comparison shop for the fuel pump relay:

How to test a GM 4.3L fuel pump?

More GM 4.3L, 5.0L, and 5.7L Tutorials. It’s very important that you start off your fuel pump relay diagnostic by first testing the fuel pump pressure with a fuel pressure test gauge. If the fuel pump relay IS NOT activating the fuel pump, the fuel pressure test gauge will register 0 PSI when cranking the engine.

What does 0 psi fuel pressure test mean?

CASE 2: You got 0 psi fuel pressure. This test result lets you know that the fuel pump is defective and is causing the engine to not start. Before you replace the fuel pump, make sure that the fuel pump relay and fuel pump fuse are supplying power to the fuel pump when the engine is being cranked.

What causes a car to not start with no gas?

Problem may be at wiring connector on top of fuel tank (hard to reach!). No gas in fuel tank (Check the fuel gauge, and keep in mind the gauge may not be reading accurately). Bad gas (Contaminated with water or too much alcohol or diesel fuel). If you just filled up with gas and now your car won’t start, suspect bad gas.

What should fuel pressure be when no Buzz?

Fuel pressure is typically in the 35 to 45 psi range. If your Anti-Theft light is flashing; the anti-theft system is disabling the fuel pump to prevent the engine from starting. Bad fuel pump (Pump should run for a few seconds when ignition key is turned to start, no buzz means no fuel delivery to the engine).

How much psi does a fuel pump need to start?

The fuel pump produces much more than just 50 PSI of course.. but the bare minimum the engine needs to start is 50 PSI… so anything less and it will crank for ever before it starts or not start at all.

What happens when fuel pressure drops to 0?

Or the fuel pressure gauge’s needle will immediately drop to 0 PSI. If the fuel pressure drops down to 0 PSI within seconds, then you’ve got a problem. In a system where the fuel pressure regulator or fuel Lines are not leaking, the pressure should hold steady (not dropping to zero) for about 5 minutes.

What should the fuel pressure be to start a Vortec engine?

The fuel system in your 4.3L, 5.0L, or 5.7L Vortec engine needs at least 50 PSI of fuel pressure to start. The fuel pump produces much more than just 50 PSI of course but the bare minimum the engine needs to start is 50 PSI… so anything less and it will crank for ever before it starts or not start at all.

1997 Chevy C1500, 2WD, 5.7L won’t start – cranks fine. No codes – good fuel pressure ( 60+ psi – new pump), good spark, 1997 Chevy C1500, 2WD, 5.7L wont start – cranks fine. No… It will not start. I changed the fuel filter and fuel pump It will not start. I changed the fuel filter and fuel pump relay.

How to troubleshoot fuel pump in GM 4.3L?

Once the intake air duct is back on the throttle body, have your assistant, inside the vehicle, crank the engine. 1.) The engine will start momentarily and after a few seconds will die. 2.) The engine will only crank but not start at all. 3.) The engine will start and stay running. OK, let’s find out what your results mean:

If the fuel pump relay IS NOT activating the fuel pump, the fuel pressure test gauge will register 0 PSI when cranking the engine. If the fuel pump relay is activating the fuel pump, then it’ll register about 56-62 PSI even if the engine does not start. Any fuel pressure below 50 PSI and the engine will NOT start.

What to do if your Chevy fuel pump fails?

Chevrolet fuel pump failures are a common and growing problem. If you have a fuel pump harness connector that looks like the flat one on the right or the square one at the bottom, then consider replacing it when replacing the pump. More details about this are below, but you might want to download your Chevy manual to help.

When did the Chevy fuel pump come out?

It started on Chevrolet truck models from 1996 to 2003 model years, but has expanded to other models as the connector and pump assemblies are not aging well. In fact, I have a financially strapped friend with an 04 Silverado that now caries a heavy rubber mallet in the truck.

Where to check for no start fuel pump?

The first thing you want to do is check the fuse panel to see if the fuse is blown. If your car has two fuse panels than the one in the engine compartment; should be the correct one to check. The fuse panel or circuit box is usually located near the battery; and is a small black box with a removable lid.

The fuel pump produces much more than just 50 PSI of course.. but the bare minimum the engine needs to start is 50 PSI… so anything less and it will crank for ever before it starts or not start at all.

Where can I find the Spider fuel pump test?

You can find the fuel pressure regulator test here: How To Test The ‘Spider’ Fuel Injector Assembly (4.3L, 5.0L, 5.7L). IMPORTANT: This test result could be telling you that the PassLock anti-theft system has armed itself and is keeping your pick-up or SUV from starting.

Why does my Chevy Spark Plug not start?

Chevrolets have a common issue with fuel filters getting clogged. You always want to replace the fuel filter when replacing the fuel pump. This could cause the concern you are having. It may seem as you are getting enough fuel from the pressure regulator but if the pressure from the fuel tank is not correct, it will still not start.

How can you tell if your Trailblazer fuel pump is going out?

The only way that you are going to know that your Trailblazer’s fuel pump is going out is that it is no longer providing enough fuel pressure to keep the engine running under a heavy load, or at high-speed. Typically, if you are heading up a hill (or accelerating) the engine may start to feel like it is just running out of steam.

Why does my fuel pump not turn on?

Well getting to start by adding fuel to the throttle body is not going to turn on some special switch that will send a signal to the pump and injectors. I’m sure you probably just have a bad fuel pump that doesn’t have enough pressure or volume to start the truck, but at running speed can keep up.

2. Engine does not start. Another symptom of a faulty fuel pump relay is an engine that does not start. If the fuel pump relay fails the fuel pump will be left without power. The engine may still crank when the key is turned, however it will not be able to start due to lack of fuel.

Fuel pressure is typically in the 35 to 45 psi range. If your Anti-Theft light is flashing; the anti-theft system is disabling the fuel pump to prevent the engine from starting. Bad fuel pump (Pump should run for a few seconds when ignition key is turned to start, no buzz means no fuel delivery to the engine).

What should the fuel pressure be on a 4.3L V8?

This is where you’ll connect your fuel pressure gauge (the first photo, in the image viewer, is of a 4.3L, and the second of the V8 engine). NOTE: In case you’re wondering, the factory manual specifies that the fuel pressure for the CSFI system should be between 56-62 PSI.

Why does my car have no fuel pressure?

Many people recognize this sound every time they start the car but don’t realize it is the fuel pump running. If you “DO NOT” hear the buzz of the fuel pump; then your engine has no fuel pressure, and we need to see why. The first thing you want to do is check the fuse panel to see if the fuse is blown.

What to do if your fuel pump is not working?

If nothing after that, then the fuel pressure regulator is not working and needs replacing. If you get pressure to the rail, then there could be a problem with the injectors; they may be either dirty or plugged up. Take the injectors off the engine and clean them with CLR.

The fuel pump produces much more than just 50 PSI of course but the bare minimum the engine needs to start is 50 PSI. Anything less and it will crank for ever before it starts or not start at all. So, the very first thing you need to do is to verify that the fuel pump is delivering at least 50 PSI of fuel pressure while the engine is cranking.

Many people recognize this sound every time they start the car but don’t realize it is the fuel pump running. If you “DO NOT” hear the buzz of the fuel pump; then your engine has no fuel pressure, and we need to see why. The first thing you want to do is check the fuse panel to see if the fuse is blown.

What should the PSI be on the fuel pump?

With the engine off and key on, there should be 45 to 60 PSI on the gauge. If there is nothing on the gauge, then check your connection to the shrader valve. You may need to remove the shrader part of the valve from the threaded tube. If there is still no pressure, then replace the fuel filter and retest.

What to do when your fuel pump pressure is low?

If fuel pressure is low, disconnect the vacuum hose to the regulator or check the sensors that control the regulator in the tank. You should see an increase in pressure if the regulator is not leaking. No change would indicate a bad regulator. Likewise, you can pinch or block the return line temporarily to see if pressure goes up.

What to do if your outboard fuel pump is not working?

Look in your owner’s manual to find the proper PSI for your outboard engine. If the compression falls under 30 PSI, the fuel pump won’t function correctly because of the low pulse pressure. Look to fix the compression issues first. If the compression seems okay, you can reinstall the spark plug and perform the same test on the other cylinders.

How can I tell if my fuel pump is leaking?

Once the fuel pressure gauge registers pressure, check for fuel leaks around the Schrader valve. It’s very important that NO fuel leaks are present for the accuracy of the test. Once you have verified no fuel leaks, continue to the next step.

You can find the fuel pressure regulator test here: How To Test The ‘Spider’ Fuel Injector Assembly (4.3L, 5.0L, 5.7L). IMPORTANT: This test result could be telling you that the PassLock anti-theft system has armed itself and is keeping your pick-up or SUV from starting.

Once the fuel pressure gauge registers pressure, check for fuel leaks around the Schrader valve. It’s very important that NO fuel leaks are present for the accuracy of the test. Once you have verified no fuel leaks, continue to the next step.

What happens when a fuel pump relay goes bad?

If the fuel pump relay has an issue while the vehicle is operating it will cut off power to the fuel pump, which will cause the engine to stall. A faulty relay may allow the vehicle to be restarted a short while later, while a completely failed relay will not.

When did the second generation Chevy Astro come out?

In this article, we consider the second-generation Chevrolet Astro, produced from 1995 to 2005.

What are the signs of a failing fuel pump?

Signs and Symptoms of a Failing Fuel Pump. When the fuel pump is heated frequently within a few moments of turning the vehicle on, such as is common in stop-and-go driving patterns, the fuel pump may overheat and cause the engine to overhead too. Typically, you may drive for 15 to 30 minutes, and then suddenly stop working and the engine gets hot.

Why does my car accelerate when the fuel pump is not working?

When this mismatch becomes great enough, the pressure in your fuel lines can become inconsistent. In these circumstances, drivers may find their cars suddenly accelerating for a few moments even when they haven’t pressed the gas pedal, a condition known as surging. 5. Fuel Pump Failure Might Be a Reason Why Your Engine Won’t Start

When is it time to replace your fuel pump?

Like any device, however, fuel pumps can and do eventually wear out after thousands of miles of use. If your car struggles with weak or inconsistent power, it may be time to replace the fuel pump on your car. Have you ever had to deal with a failing fuel pump?

What to do if your fuel pump relay is failing?

If your vehicle is displaying any of the symptoms above, or you suspect that your fuel pump relay is having an an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the component should be replaced.

Where is the fuel pump control module located?

It is often found in the fuse box located in the engine bay and functions as the primary electronic switch that controls power to the fuel pump. The fuel pump relay is usually controlled by the ignition or Powertrain Control Module , and when switched on, will provide current to the fuel pump so that it may function.

Can a car start with no fuel in it?

Once your fuel pump has finally given up the ghost, no fuel will reach your engine. You may hear your spark plugs firing when you try to start your car, but without fuel, the engine won’t be able to turn over. Of course, there could be other explanations for your engine’s failure to start besides a failed fuel pump.

How to replace a fuel pump in an Astro van?

Astro Van Fuel Pump Replacement – 1996-2005 (GMC Safari) – 4 MINUTE DIY VIDEO – YouTube NOTE: For some reason some models have an additional cover over the gas tank.

Can a GMC Sierra run without a fuel pump?

Without gas your Sierra will not run at all. With that in mind, most of the symptoms of a bad fuel pump revolve around the vehicle stalling out or not running at all. In modern fuel injected vehicles, the fuel pump sits right in the fuel tank and “pushes” the gasoline to the fuel rail (s).

How can you tell if your fuel pump is failing?

If you ignore all of the other warning signs of a failing fuel pump, it will eventually fail completely. Once your fuel pump has finally given up the ghost, no fuel will reach your engine. You may hear your spark plugs firing when you try to start your car, but without fuel, the engine won’t be able to turn over.

Can a fuel pump crank while the engine is cranking?

So, the very first thing you need to do is to verify that the fuel pump is delivering at least 50 PSI of fuel pressure while the engine is cranking. Yes… while the engine is cranking. Locate the Schrader valve on the fuel line that connects to the ‘Spider’ assembly.


Why does my fuel pump not start when I change it?

You always want to replace the fuel filter when replacing the fuel pump. This could cause the concern you are having. It may seem as you are getting enough fuel from the pressure regulator but if the pressure from the fuel tank is not correct, it will still not start. Another problem you could be having is spark.

Chevrolets have a common issue with fuel filters getting clogged. You always want to replace the fuel filter when replacing the fuel pump. This could cause the concern you are having. It may seem as you are getting enough fuel from the pressure regulator but if the pressure from the fuel tank is not correct, it will still not start.

How to test the fuel pump on a Chevy Silverado?

All of the following fuel pressure test gauge kits will help test the fuel pump on your Chevrolet Silverado (Suburban, Tahoe) and GMC Sierra (Yukon, Yukon XL): As I mentioned at the beginning, testing the fuel pump simply involves connecting the fuel pressure test gauge to the fuel system.

Can a 1997 Chevy c1500 5.7L start?

1997 Chevy C1500, 2WD, 5.7L won’t start – cranks fine. No codes – good fuel pressure ( 60+ psi – new pump), good spark, 1997 Chevy C1500, 2WD, 5.7L wont start – cranks fine. No… It will not start. I changed the fuel filter and fuel pump It will not start.

Can a Chevy C / K 1500 run without fuel?

Also I haven’t fully checked the Spark, but the Truck run’s fine when you spray Starting fluid into the Throttle body. Any suggestions on why the truck isn’t accepting the fuel, it cranks fine, just wont run without starting fluid. these trucks have to have between 55-65psi of fuel to run.

1997 Chevy C1500, 2WD, 5.7L won’t start – cranks fine. No codes – good fuel pressure ( 60+ psi – new pump), good spark, 1997 Chevy C1500, 2WD, 5.7L wont start – cranks fine. No… It will not start. I changed the fuel filter and fuel pump It will not start.

How can I tell if my fuel pump is cranking?

Get under the truck and see if you can figure which wire powers the pump and check it with a volt meter or a test light to see if it is getting power key on and also cranking. while you are under there check the pump circuit ground because I recall them being down where they get bombarded with whatever might be on the road surface and corrode up.

Problem may be at wiring connector on top of fuel tank (hard to reach!). No gas in fuel tank (Check the fuel gauge, and keep in mind the gauge may not be reading accurately). Bad gas (Contaminated with water or too much alcohol or diesel fuel). If you just filled up with gas and now your car won’t start, suspect bad gas.

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Ruth Doyle