What causes low fuel pressure on a Chevy Silverado?

Took the chevy dealer and they causing the low fuel pressure. 50 psi. I bought the truck home and change the pump. Still no luck 50 psi at the rail. Changed the filter. No luck. 54 psi at the rail. Changed the fuel regulator. 52 psi at rail.

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.

How to test the fuel pump in a V8?

These are the test steps: 1 Connect your fuel pressure tester to the Schrader valve. 2 Have your helper crank the engine while you observe the needle on the fuel pressure tester gauge. 3 The fuel pressure tester should give you a reading between 55 to 62 PSI.

What happens if your fuel pump stops working?

A fuel pump will generally fail in one of two ways. It’ll either stop working completely (producing no fuel pressure) and cause an engine no-start problem. Or the fuel pump will begin to fail and function only enough to start the vehicle but the engine will not run optimally.

What to do when your fuel pressure goes down?

Also, even if the pump puts out 60 psi while the engine is running, the pump cant pressurize the system for immediate start up once the pressure has dropped significantly. Mine would need to be cranked for 10-15 seconds before the engine would start when it was the worst.

Why is my Chevy Vortec 4300 V6 leaking fuel?

In the L35 and LF6 engines, the spider injectors are known to leak at the pressure regulator and at the supply and return lines due to a design fault. Outside of leaking fuel onto the exterior of the engine itself, it can cause excess fuel to get sucked into the engine.

Is the 98 Chevy 5.7 misfire running right?

I have a 98 chevy 1500 5.7. The truck doesnt run right at all. Msifres bad under acceleration. Idle ok when misses when reving and accelerating. I did a full tune up including plugs, wires, cap rotor and a new distributor. With key on i have about 60psi fuel pressure but idleing i only had 50psi.

What’s the fuel pressure on a Chevy C / K 1500?

With key on i have about 60psi fuel pressure but idleing i only had 50psi. I put a complete new fuel pump unit in and changed fuel filter. Same problem. no different fuel pressure.

When does a Chevy 5.3L engine leak air?

When Problems regarding Chevy 5.3L engines, GM states a limited amount of air will leak from the bleed holes and outlets ports. Even when the solenoids are off, compare the amount of leakage to verify all 4 solenoids are operating the same. If it isolates a concern with the VLOM, replace it and reevaluate the concern. 3.

What’s the fuel pressure on a 1998 Chevy k1500?

Here are the tests I’ve done so far fuel pressure test, fuel pressure 160psi while running, then shut off for 20 min and fuel pressure was at 155 PSI. Dry Compression test on all 8 cylinders between 150-160 psi.

What to do if your Chevy 5.3L engine is not working?

1. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. Regardless of the AFM solenoid being commanded on or off.

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’s the fuel pressure on a Chevy Silverado?

Ok…So I get 55-58psi with the key on/engine off, for about 2 seconds while the pump is on. as soon as the pump stops it drops do about 52psi. the truck refuses to start. Cranks fine, and seems like its about to start but just dies.

What does it mean when your fuel pressure is too low?

20 psi is definitely too low. Have you allowed the pump to run long enough to fill the filter? Another test that is indicated with low fuel pressure is to clamp off the return line and run the pump. If the pressure is still too low, that indicates that the pump is bad.

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

The only way that you are going to know that your Silverado’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 Silverado have a trouble code P0420?

If you get P0420 or P0430 trouble codes with a scanner, it very well may be the catalytic converter causing these symptoms. One of the best indicators of a clogged fuel pump is going to be that the your Silverado is difficult to start. This because there’s not enough fuel pressure to properly atomize the fuel as it enters the combustion chamber.

What are the symptoms of a bad fuel pump?

Here are the most common symptoms of a bad fuel pump in your Chevy Silverado: One of the most common signs that a fuel pump is going bad is a whining sound. The whining sound can indicate that the fuel pump is going out before there are any performance based issues. Keeping an open ear can save you from getting stuck somewhere with a bad fuel pump.

What kind of fuel pressure does a 2003 Silverado have?

Discussion in ‘ Engine & Drivetrain ‘ started by westman995, Jul 5, 2016 . I am trying to diagnose a 2003 silverado with the 6.0 vortec in it. Fuel pressure is around 40 psi key on engine off and while running. It goes up a little bit while running or revving it up but not much. The truck starts up no problem but it runs like crap.

What’s the fuel pressure on a Chevy truck?

Fuel pressure is good, 58 psi and holds around 50 psi after key is turned off It has spark as evidenced by putting an old spark plug into a spark plug wire and grounding the plug After spraying a small amount of starting fluid into the air intake tube, the engine starts for just a moment, then dies

Why does my Chevy truck not start when parked?

Three or four years ago the truck had the Reduced Engine Power warning problem. I was going to fix it “tomorrow”, but didn’t find the time, so I parked the vehicle and started the engine every two weeks and let it idle for about 20 minutes.

Why does my GMC Sierra engine not start?

It seems this can also be caused by faulty APP (Accelerator Pedal Position) sensor. First I would check the INJ1 and INJ2 fuses in the under the hood fuse box.