Question about 1988 Ford Ranger

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Where is the fuel pump relay switch located

We were driving and the truck stopped running. i went to the fuel rail and no pressure. i think the relay switch went bad

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Check fuses relay on left inner fender in black box take on lid inside of box they are marked if all fusses & relays are all right, then your fuel pump is went bad

Posted on May 18, 2014

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Posted on Jan 02, 2017

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SOURCE: truck starts, dies. truck runs good some days,bad the next

I had the same problem with My 1990 F150 300 6cylinder 4x4.....I cahnged all the same things you did, finally I sprayed a can of Gumout through the throttle body and it worked and ran great. Now I add fuel injector cleaner to the gas and a regular clean with the gumout and the problem has'nt come back. Good Luck to you and hope it works!

Posted on Oct 06, 2008

ourhowse
  • 2007 Answers

SOURCE: I don't here the fuel pump ever kick on in my 1990 Ford F150, and I tested all of the fuses and they are good. I was thinking the relay for the fuel pump might be bad -- any suggestions?

It's under your hood, in one of those boxes, and should be marked. Your pump won't cut in if it's fried either. Check to see if there is power at the pump. Maybe you just have a loose wire. You can always hope!

Posted on May 20, 2009

  • 288 Answers

SOURCE: cranks but won't start,new fuel pump,no power going to pump

look at inerata reset switch check for power at the switch

Posted on Jun 23, 2009

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SOURCE: '88 f150 will not start, 0 fuel pressure

I know the ford cars had a trip relay for the fuel pump. In the event of a wreck it shuts the fuel pump down and has to be reset manually. I am unsure if the pickups had the same thing.

Posted on Jul 11, 2009

emissionwiz
  • 76846 Answers

SOURCE: 1991 ford f-150 fuel pump will not come on

remember the switch only gets power for 1 second when u turn the key on, the common problem is the ignition starter switch comes apart, it is located at top of the steering column near the bottom, drop the column down (2 nuts) and inspect the switch for separation.

Posted on Jul 27, 2009

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Changed my fuel pump on my 06 ford 500 now I can only start if I hold the fuel reset and it doesn't stay running for very long why does that happen how can I fix this


By fuel reset do you mean inertia fuel cut off switch ? Why did you change the fuel pump ? Are you aware of the fuel pump driver module ! Your vehicle has a electronic returnless fuel system . It is computer controlled , has a fuel rail pressure an temp. sensor .
The FRPT sensor measures the pressure and temperature of the fuel in the fuel rail and sends these signals to the PCM. The sensor uses the intake manifold vacuum as a reference to determine the pressure difference between the fuel rail and the intake manifold. The relationship between fuel pressure and fuel temperature is used to determine the possible presence of fuel vapor in the fuel rail. Both pressure and temperature signals are used to control the speed of the fuel pump. The speed of the fuel pump sustains fuel rail pressure which preserves fuel in its liquid state. The dynamic range of the fuel injectors increase because of the higher rail pressure, which allows the injector pulse width to decrease.
Inertia Fuel Shutoff (IFS) Switch The IFS switch is used in conjunction with the electric fuel pump. The purpose of the IFS switch is to shutoff the fuel pump if a collision occurs. It consists of a steel ball held in place by a magnet. When a sharp impact occurs, the ball breaks loose from the magnet, rolls up a conical ramp and strikes a target plate which opens the electrical contacts of the switch and shuts off the electric fuel pump. Once the switch is open, it must be manually reset before restarting the vehicle. Refer to the Owner's Literature for the location of the IFS.
The FPDM receives a duty cycle signal from the PCM and controls the fuel pump operation in relation to this duty cycle. This results in variable speed fuel pump operation. The FPDM sends diagnostic information to the PCM on the fuel pump monitor circuit. For additional information on Fuel Pump Control and the Fuel Pump Monitor, refer to Fuel Systems in this section.
Electronic Returnless Fuel System (ERFS) The electronic returnless fuel system consists of a fuel tank with reservoir, the fuel pump, the fuel rail pressure (FRP) or fuel rail pressure temperature (FRPT) sensor, the fuel filter, the fuel supply line, the fuel rail temperature (FRT) sensor, the fuel rail, the fuel injectors, and a Schrader valve/pressure test point. For additional information on the fuel system components, refer to Engine Control Components in this section. Operation of the system is as follows:
  1. The fuel delivery system is enabled during crank or running mode once the PCM receives a crankshaft position (CKP) sensor signal.
  1. The fuel pump logic is defined in the fuel system control strategy and is executed by the PCM.
  1. The PCM commands a duty cycle to the fuel pump driver module (FPDM).
  1. The FPDM modulates the voltage to the fuel pump (FP) required to achieve the correct fuel pressure. Voltage for the fuel pump is supplied by the power relay or FPDM power supply relay. For additional information refer to Fuel Pump Control and Fuel Pump Monitor.
  1. The fuel rail pressure (FRP) sensor provides the PCM with the current fuel rail pressure. The PCM uses this information to vary the duty cycle output to the FPDM to compensate for varying loads.
  1. The fuel rail temperature (FRT) sensor measures the current fuel temperatures in the fuel rail. This information is used to vary the fuel pressure and avoid fuel system vaporization.
  1. The fuel injector is a solenoid-operated valve that meters the fuel flow to each combustion cylinder. The fuel injector is opened and closed a constant number of times per crankshaft revolution. The amount of fuel is controlled by the length of time the fuel injector is held open. The injector is normally closed and is operated by 12-volt VPWR from the power relay. The ground signal is controlled by the PCM.
  1. A pressure test point valve (Schrader valve) is located on the fuel rail and is used to measure the fuel injector supply pressure for diagnostic procedures and repairs. On vehicles not equipped with a Schrader valve, use the Rotunda Fuel Pressure Test Kit 134-R0087 or equivalent.
  1. There are 3 filtering or screening devices in the fuel delivery system. The intake sock is a fine, nylon mesh screen mounted on the intake side of the fuel pump. There is a fuel filter screen located at the fuel rail side of the fuel injector. The fuel filter assembly is located between the fuel pump and the pressure test point/Schrader valve.
  1. The fuel pump (FP) module is a device that contains the fuel pump and the fuel sender assembly. The fuel pump is located inside the reservoir and supplies fuel through the fuel pump module manifold to the engine and the fuel pump module jet pump.
  1. The inertia fuel shut-off (IFS) switch is used to de-energize the fuel delivery secondary circuit in the event of a collision. The IFS switch is a safety device that should only be reset after a thorough inspection of the vehicle following a collision.
Go to you tube , there are videos how this system works an to test it .

Nov 18, 2015 | Ford Cars & Trucks

1 Answer

Truck will start and then stops just started acting up


Found on a '92 Toyota pickup w/V6, a bad/intermittent fuel pump relay.
Had fuel rail pressure so fooled us initially, found by listening to pump run then quit, cycle key and pump would run again then quit, sometimes when trying to start, motor would start and run for a few seconds then quit, or not start at all, this created by intermittent relay operation. Need two people, one at passenger side by tank and other to work ignition switch.
Relay located behind right, passenger kick panel, dealer item I believe about $28.00.
Just another possibility.

Mar 12, 2014 | 1992 Toyota Pickup

1 Answer

No exceleration now truck wont start


Fuel pump relay, turning the ignition on runs the fuel pump for about two seconds to pressure the fuel rail to start, then the fuel pump relay takes over once engine is started, it relies on a signal from the ignition or ECU (to say keep running). Either the relay has gone down or the relay has lost the signal. Don't bypass the relay, it's a safety feature, to stop the fuel pump if a fuel line ruptures.

Dec 27, 2013 | 2007 Mercury Mountaineer

1 Answer

Where is the fule pressure sensor on 1998 lincoln continental


I'm not aware of a fuel pressure sensor, you have a fuel pump relay and inertia switch that powers the pump, and a fuel pressure regulator on the fuel rail. If there is a fuel pressure sensor, I would think it would be on the fuel rail with the injectors.
Have you replaced the fuel filter and checked the fuel pressure with a gauge ?

Aug 20, 2012 | 1998 Lincoln Continental

2 Answers

Car died in front of house, would crank, but not start...fuel pump has been buzzing for a while so i assumed it went out, replaced pump & filter, sadly cant get it to start. checked all fuses, relays...


No pressure at fuel rail either mean a clog in the fuel lines or filter...or a failed or incorrectly installed pump. If you have voltage at the pump when you are cranking the engine over recheck pump and fuel filter. also try applying shop are to the fuel lines when disconnecting at pump and fuel rail to clear any clogs.

Dec 15, 2010 | 2002 Chevrolet Suburban

1 Answer

I have no fuel pressure to the pressure test valve on the fuel rail. I am thinking it is the fuel pump but perhaps I am wrong? Any advice would be greatly appreciated!


There is a safety cutoff switch called an Inertia switch. It can be located in the trunk area or behind one of the front kick panels. This switch can sometimes trip when a door or trunklid is closed. There is a reset button on it and you just push and hold the button for a second or two and it is reset.

When you turn your key to the Run position you should hear the fuel pump run briefly to pressure up the system. It will only run a few seconds as that is all it needs for the pressure. There is also a Relay in one of the Black boxes and one is for the fuel pump. This Relay also needs the Inertia switch to work before the power gets to the pump. Finally you may find a fuse for the pump in the fuseblock under the dash. Your Owners Manual should describe each location.,

Nov 03, 2010 | 2003 Ford Mustang

2 Answers

Ive got a 1997 cavalier it will start but quickly dies out ive got fire to my plugs and fuel to the injectures ive just replaced the ignition switch is there somkind of a security


You need a new fuel pump relay. The engine fires up and runs off the oil pressure switch untill the oil pressure PSI is reached at normal operating conditions. When the oil pressure reaches its operating PSI the PCM or engines computer will shut off that circuit and turns on the fuel pump relay to run the fuel pump untill you shut the engine off

Apr 19, 2010 | 1997 Chevrolet Cavalier

2 Answers

1998 gmc 2500 sle 5.7 wont stay running


Theres only one fuel pump relay, unless you have dual tanks. Be sure you have 55-60 psi fuel pressure. I "think" the oil pressure switch supplies power to the fuel pump after the engine is running.

Dec 14, 2009 | 1998 GMC Sierra

2 Answers

I have a 1995 Dodge Neon with a 1999 motor in it. Recently it has had some issues starting. All I would have to do is just switch the relays (usually horn to fuel pump and vice versa) and it would start....


If switching relays got the car started for you before, maybe you had a relay that was sticking. Check the fuel pump relay & the ASD (Automatic Shutdown) relay. Either relay will keep the fuel pump from working. Listen for the fuel pump when you turn the key on. It should run for a few seconds & then stop.

Jan 09, 2009 | 1999 Dodge Neon

1 Answer

Fuel problem


was this vehicle hit could be faulty fuel cut off switch best way hook a fuel pump pressure gauge to shrader valve located on fuel rail check pressure if not within specs possible regulator

Jul 25, 2008 | 1999 Toyota RAV4

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