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Fuel relay problems - Land Cruiser Toyota Cars & Trucks

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Posted on Apr 28, 2013

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Fuel pump runs continous if switch is on


check for faulty fuel pressure regulator

May 01, 2016 | Mitsubishi 3000GT Cars & Trucks

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Fuel pump relay clicking. Fuel pump was changed 5 mouths ago.


Does vehicle start an run ? amp draw test the fuel pump , relay bad . Most vehicles the PCM controls the fuel pump relay . Just because relay is clicking does not mean fuel pump has a problem . Auto Repair How to Check Fuel Pump Relay Fuel Pump Electrical Circuits Description and Operation

Mar 16, 2016 | Cars & Trucks

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My 94 Chevy s10 truck 2.2 liter 4 cylinder manual motor has a fuel problem no gas is getting to motor and I replaced fuel pump! Where is FP relay switch located?


You might have a distributor pick-up problem. This is what fires the distributor. When it registers the engine is turning it turns on the fuel pump. And the relay should be on the firewall above the heater box.

Jun 06, 2015 | 1994 Chevrolet S-10

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Were is a fuel pump relay switch located on a 2000 Oldsmobile intrigued


Hey James , It's in the under hood fuse box , F/PMP relay an there is a fuse F/PMP 15 amp. Underhood Accessory Wiring Junction Block
Right side of the engine compartment, mounted to the strut tower

The PCM controls the fuel pump relay by supplying switched ignition voltage to the fuel pump relay coil. When the ignition switch is first turned On, the PCM energizes the fuel pump relay. The relay contacts close applying power to the fuel pump. The fuel pump relay will remain On as long as the engine is running or cranking and the PCM is receiving reference pulses. If no reference pulses are present, the PCM de-energizes the fuel pump relay within 2 seconds. With the engine stopped, the fuel pump can be turned On with a scan tool.
If the PCM detects a problem on the relay control circuit, DTC P0230 will set. Use this table if DTC P0230 is not set and a problem exists with the fuel pump!

Apr 13, 2015 | Oldsmobile Cars & Trucks

1 Answer

2000 mercury grand marquis 4.6 fuel


Voltage drop test the electrical circuit , do know how to do automotive electrical testing . Lose connection , resistance in the circuit , lose ground Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia Testing Electric Fuel Pump Problems with Voltage Drop Test

Feb 27, 2017 | 2000 Mercury Grand Marquis

1 Answer

2000 mercury grand marquis 4.6 Intermittent problem. 35,000. miles. Problem engine died several times wile driving. Also after car is parked from a drive will not start. Found that the fuel pump is not...


I'd have to test when problem is ongoing. When you first turn on key, no crank, you should hear the pump run for a few seconds then stop. For initial prime, the computer doesn't need rpm signal. Engine cranking, the computer needs to see rpm signal or it won't ground the fuel pump relay. W/o rpm signal, no spark at the plugs and no fuel injector pulse. I know your talking about fuel, but, when problem is ongoing, check spark and fuel injector pulse, engine cranking.
Intermittent problems are a pain, have to test when problem is ongoing.
mercury fuel pump-i4kx0gxqalhdz4ok10irisui-5-0.jpg

Feb 27, 2017 | 2006 Mercury Grand Marquis

1 Answer

2000 mercurt grand marquis


Not guessing as to what the problem is , testing for voltage drop problems with a volt meter . posted a video on youtube yesterday . If your still looking for guesses forget it , no one on here could say for sure without testing the circuit an hooking up a scan tool to see if PCM is energizing the relay . Do yourself a favor an take it to a qualified repair shop . Fuel Pump Electrical Circuits Description and Operation If you can't learn how to test from this guy , better take to a repair shop .

Mar 01, 2017 | Ford Cars & Trucks

1 Answer

Car will turn over but won't start. Through the


No noise from fuel pump when you turn over the car .First thing get voltage at fuel pump relay checked, is there 12 volt to the relay.If no, then problem is again the relay.--------- To reconfirm the problem, try other test, that is remove the relay and by pass the relay terminals with a jumper wire .Then with 12 volt external battery give power to fuel pump connector and see, if the fuel pump starts, then its clear that fuel pump relay is faulty.----------- Also other problem can be fuel pump inertia switch.If the inertia switch is faulty then also fuel pump will not start.-------- The fuel pump relay on a 1995 Ford Explorer is in the power distribution
box, in the engine compartment, driver's side near the firewall.----------
The fuel pump inertia switch is in the right front passenger area
it is below the dash but above the carpet in the right hand corner.--------
Its a push button type inertia switch.
--------
Fuel Pump Activation
When ignition switch is turned to START position, PCM operates fuel pump relay to provide fuel for starting engine. PCM senses engine speed and shuts off fuel pump by opening ground circuit to fuel pump relay when engine stops or engine speed drops to less than 120 RPM. When ignition switch is in ON position, EEC power relay is energized (contacts closed). Power is provided to fuel pump relay and timer in PCM. Fuel pump receives power through fuel pump relay contacts.
Inertia Fuel Shutoff (IFS) Switch
All models use an electrical interrupt switch in fuel system. During a collision or vehicle rollover, electrical contacts within inertia switch open, shutting off fuel supply to electric fuel pump. Fuel supply is interrupted even when engine is running.
A reset button is located on switch assembly. If electrical circuit trips, vehicle will not restart until switch is reset. Fuel system should be inspected before resetting switch.
IFS switch is located under instrument panel, near right side of transmission hump.
----------- If the fuel pump relay, the inertia switch and fuel pump all checked ok, and fuel pump is working with direct 12 volt source to fuel pump.Then problem relates to computer.The computer (power control module, PCM) is faulty and has to be replaced.--------- This will help.Thanks.Helpmech.

Jul 17, 2011 | 1995 Ford Explorer

2 Answers

2004 Sunfire Problem starting and shutting down on occasion


I'd want to check voltage and ground for fuel pump relay. The load side of relay is the line with arrowhead, when relay is energized that line with arrowhead moves to other terminal and sends voltage to fuel pump on gray wire. The control side of relay is that coil symbol, it has to have voltage and ground, the voltage comes from pcm, the ground is a chassis ground. The voltage for load side of relay is fuse protected, fp/inj fuse. fuel pump-mo2osvehtzbwzhstuaetpz2s-2-0.jpg

May 12, 2017 | 2004 Pontiac Sunfire

1 Answer

Fuel keeps cutting in and out


If it's an electrical problem, it's most likely your fuel relay. Try metering your fuel relay with a voltage meter. If you have voltage coming in, but not going out, then your relay is bad. If your relay is ok, chances are you either have a short in your wiring or your fuel pump is starting to give out on you. Your best bet's on the relay though. Hope this helps solve your problem. Have a great day!

Nov 23, 2008 | 1990 Mitsubishi Eclipse

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