Where is the fuse for the fuel pump?

The fuse is called: Fuel System/Anti-theft Maxi-fuse. It’s under the hood, in the fuse/relay box. You are getting voltage, so, the fuse is ok. You should have 12 volts at the dark green/yellow wire at the fuel pump relay. The inertial fuel shutoff switch is between the relay and the fuel pump.

What should the voltage be at the fuel pump relay?

You should have 12 volts at the dark green/yellow wire at the fuel pump relay. The inertial fuel shutoff switch is between the relay and the fuel pump. The pink/black wire from the inertial switch to the fuel pump should have 12 volts. You can measure the voltage, on the pink/black wire, at the fuel pump.

Where is the fuel pump voltage test located?

It is located at the back of the vehicle next to or in the fuel tank. It pumps fuel from the tank to the engine. The pump voltage test is important for checking the effectiveness of the fuel pump. Here’s how to perform the test. Connect the digital multimeter to the positive and negative terminals of the fuel pump.

How can I tell if my fuel pump is failing?

Check the fuel pump fuse. Often, it’s not the pump itself that fails to function, but the power that supplies it. Check in your owner’s manual for the location of the fuse box, then find the fuse that corresponds to the fuel pump. Pull it out and inspect it for signs of failure.

What to do if your fuel pump relay is faulty?

If you need to bypass it for testing, use a fused jumper wire from fuse F46 to the fuel pump power terminal. If it works the fuel pump and voltage holds steady, the relay is faulty. You can check the high pressure system on turbocharged models using a MINI scan tool.

How to check the high pressure fuel pump?

You can check the high pressure system on turbocharged models using a MINI scan tool. Use the scan tool to view DME, then fuel pump / pressure. Look for the rail pressure set point (desired) and rail pressure actual. These two values should be pretty close. If it’s off by 10 bar, I would suspect a faulty high pressure fuel pump.

How to check fuel pump voltage in Mini Cooper?

Use a wiring diagram for your vehicle to be sure you are on the right wire. While connected to the fuel pump connector (red arrow), turn the key ON. The DVOM (yellow arrow) should read battery volts (around 12 volts). If no voltage is found, check the relay and fuel pump fuse.

What happens when a fuel pump goes bad?

A faulty fuel pump can cause poor engine performance and hard starting problems. When it fails completely, you may be left with an engine that doesn’t start. If you suspect your fuel pump has failed, you can confirm the fuel pump has received the correct voltage when commanded ON by the fuel pump relay using a digital volt ohm-meter (DVOM).

What does low voltage on fuel pump relay mean?

The code will be set if a low voltage on the control circuit of the fuel pump relay is detected by the ECM. P0231 FORD Possible Symptoms Engine Light ON (or Service Engine Soon Warning Light) P0231 Ford Description The Engine Control Module (ECM) provides ignition positive voltage to the coil side of the fuel pump relay.

What causes the fuel pump code to be set?

The code will be set if a low voltage on the control circuit of the fuel pump relay is detected by the ECM. The Engine Control Module ( ECM) provides ignition positive voltage to the coil side of the fuel pump relay.

How to diagnose p0231 Ford fuel pump low?

1. Disconnect the inertia switch harness connector 2. Turn key to ON position (Engine OFF) 3. Measure voltage of circuit between inertia switch harness connector and ground 4. If battery voltage is found, replaced Inertia Switch 5. Clear codes. User Submitted Video What does this mean? Cost of diagnosing the P0231 FORD code Labor: 1.0

What are the fuses in a Ford F150?

Fuel Line Heater, Lecce/Neville Alternator , Electronic Transmission Control (Diesel) TFI Ignition module, Ignition Coil, Distributor, EEC Power Relay (Gasoline) Fuse box diagram (engine compartment 1994-1997). Assignment of the fuses.

How does the fuel pump relay work in a Ford?

The fuel injection computer then grounds circuit 1. This activates the fuel pump relay to pass current from circuit 4 to circuit 3. Circuit 3 is the one that runs to the fuel pump (via the Inertia Switch) and delivers the voltage/current it needs to activate.

What makes a fuel pump have a low voltage?

The only items in this circuit are the fuse, the relay, the inertia switch, and the pump. Low voltage to the pump can only be from a low voltage at the source or a resistance in the circuit (“dropping” voltage).

What are the symptoms of a bad fuel pump relay?

A bad fuel pump relay can cause many different symptoms. Here are the most common ones The fuel pump relay is an important component of the fuel system of your vehicle. The fuel pump relay gives the fuel pump power when it is time to build up fuel pressure in the rail.

What kind of power does a fuel pump relay have?

This power is in the form of battery voltage and will range between 10 to 12 Volts DC. Power is supplied to two circuits (wires). These two wires are the ones labeled with the number 2 and the number 4.

Is there no power to the fuel pump?

No power to the fuel pump and the fuel relay is not getti… Q: No power to the fuel pump and the fuel relay is not getting power. My car has 190000 miles.

Why is my fuel pump relay outside the fuse box?

If it’s located inside the engine bay, which can get hot from the engine’s heat, the heat can impede the relay’s performance. In addition, in the rare cases where you will find the relay placed in the engine bay but outside the fuse box, it will be exposed to heat plus dust and dirt.

Why does the fuel pump relay need to be Tip Top?

The fuel pump relay needs to function in tip-top condition if the engine is expected to run without any issues. Therefore, any compromise in the fuel pump relay can directly cause engine problems, such as the stalling of the engine.

Were is the fuse and relay located if not in the box 23 people found this helpful. The fuel pump relay has no relay. Only a yellow 20 amp fuse for the pump. It may be marked under the plastic cover but not present. The control module under the truck box took the place of the fuel pump relay or fuel pump regulator.

Where is the fuel pump relay in a GMC Sierra 1500?

The control module under the truck box took the place of the fuel pump relay or fuel pump regulator. It is a 5″×5″ flat box about 1/2 in. Thick bolted up under the box. Remove spare tire to get to it. 9 people found this helpful. Remember: There is nothing in the fuse box marked [Fuel Pump] location.

What to do about a fuel pump relay?

If the fuses and relay are good, check the fuel pump relay control circuit from the relay to the engine control module/powertrain control module (ECM/PCM). If the circuit is good, have the ECM/PCM diagnosed and serviced by an authorized repair shop or dealership.

What are the fuses on a GMC Sierra?

Cruise Control, 4 WD Display Illum. Rear Window Defogger Timer, Aux. Batt. Relay Feed, Safety Belt Buzzer Timer, Cluster Ign. Feed Ign. A Dome Lamp, Cargo Lamp, Ctsy, and Glove Box Lps.

What is the fuel pump relay wiring diagram?

Fuel Pump Relay Wiring Diagram (Automatic Trans. Only) NOTE: The illlustrations and info in this page apply only to 1994 Chevrolet/GMC pickups with a 4.3L, 5.0L or a 5.7L engine. For the 1993 fuel pump wiring diagram, check out the following article: 1993 Fuel Pump Circuit Tests (GM 4.3L, 5.0L, 5.7L).

What was the fuel pump voltage in 1993?

1993 Fuel Pump Circuit Tests (GM 4.3L, 5.0L, 5.7L). Should have 10 to 12 Volts DC with Key On Engine Cranking or Key On Engine Running (KOER). This voltage comes from the GRY inline fusible link located in the engine compartment junction block.

How many volts does a fuel pump have?

Should have 10 to 12 Volts DC with Key On Engine Cranking or Key On Engine Running (KOER). This voltage comes from the GRY inline fusible link located in the engine compartment junction block. Should have 10 to 12 Volts DC when the engine is being cranked and relay has activated. Should have Ground all of the time.

Where is the fuel pump relay located on a 1987 Chevy Blazer?

Vocational, Technical or Tra… where is the fuel pump relay is on a 1987 K5 Blazer located? Also do you have to drop the fuel tank to install a new fuel pump or is there an acess … read more

Where is the fuel pump relay located on a 1987 Chevy Silverado?

Vocational, Technical or Tra… I INSTALLED A NEW FUELPUMP IN MY 1987 CHEVY SILVERADO W/ 305 tbi and it will not come on. DO I NEED TO PRIME IT TO THE RELAY … read more Vocational, Technical or Tra… where is the fuel pump relay is on a 1987 K5 Blazer located?

Where is the oil pressure switch on a fuel pump?

The fuel pump relay is wired in parallel with the oil pressure switch located adjacent to the distributor. The oil pressure switch is a redundant, fail-safe backup should the relay fail. TBI_Noid_Light.jpg (2.96 kB, 204×204 – viewed 1013 times.)

How to remove a fuel pump from a truck?

Basic instructions on how to tip your bed and remove your fuel pump and sender assembly, replacement of the fuel pump from the sender unit and putting it back into the tank with gasket o-ring and lock ring. I also show video of the bolt hole locations on my short bed frame. Loading…

How can I test if my fuel pump is running?

Look at the lowermost image here… To test: With the ignition OFF, temporarily jumper battery power to the 3″ long red pigtail coming from the relay. This will bypass the relay and feed power directly to the fuel pump circuit (via the tank selector valve, if you have dual tanks) and the pump should run.

Where is the fuse for the fuel pump?