Question about 1988 Ford F 150

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1990 ford relay for fuel pump will not shut off i replace relay and it still dont work

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  • Ford Master
  • 1,384 Answers

Since you've replaced the relay and it still runs steady,use another vehicle for a couple of days and disconnect the battery ground for a couple of days.Computer should reset and your good to go after reconnect battery terminal.Depends on the computer tho as to whether it is supposed to run constantly while engine is running.

Posted on May 14, 2014

  • Nuuan Jun 16, 2014

    All computerized fuel injected cars the fuel pump runs at all times when the engine is running. If it still runs after you have shut off the engine then you have a stuck relay or possibly a short to power in the fuel pump circuit.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 491 Answers

SOURCE: location of fuel pump relay in 1990 ford mustang

inside the engine compartment with the main fuses

Posted on Dec 21, 2008

  • 15 Answers

SOURCE: 1990 ford f150 it wont start

first off check wires to fuel pump with a light tester if you are getting power then you may have ECM or faulty pump or crossed wires

Posted on May 03, 2009

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

sscullys
  • 984 Answers

SOURCE: 1997 Ford F150 Electric Fuel Pump will npt pump

Did you check the fuel inertia switch in the passenger side kick panel ?

The fuel pump is powered :
the fuse to the fuel pump relay.
The fuel pump relay to the fuel inertia switch
The fuel inertia switch to the fuel pump itself.

At the fuel inertia switch in the kick panel, power from the relay is the Dark Green w/ Yellow stripe wire and the pink w/ black stripe wire is the power. from the fuel inertia switch to the fuel pump.

If you jumper the fuel pump relay, you should hear it run. If not pull the fuel pump relay, and check the pins in the relay socket, pin 30 should be the power from the fuse.

50b0c31.jpg

If you have power at pin #30, jumper the relay socket as shown with the red line above, and check the dark green w/ yellow stripe wire at the fuel inertia switch for power.
Press the button on the top of the fuel inertia switch, and check for power leaving the fuel inertia switch on the pink w/ black stripe wire.

This is tests good, check for power at the fuel pump, same pink w/ black stripe wire.
Fuel inertia switch info is in the owners manual, If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

Posted on Jan 03, 2010

  • 5546 Answers

SOURCE: 1990 ford festiva no power to fuel pump. replaced

The pump should have a fuse in the fuse block. You need to check for power in the fuse block and you need to check power to the pump relay.

Sometimes there is a fusible link to the Relay. If you check the connector terminals for power where the Relay plugs in, you can determine if the fusible link has blown. You could have already replaced the bad parts and now need to restore power to the Relay.

Posted on Oct 10, 2010

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3 Answers

Replaced fuel pump,strainer,fuel filter,battery,computer,car will only start when you pour gas down air intake.


Sorry this vehicle does not have a fuel shut off switch or inertia switch > that's ford ! If you pour fuel in the throttle body an it runs It's something with the fuel system , an if you replaced the pump an filter an regulator , It has to be electrical ! did you check voltage at the fuel pump relay ? What engine does yours have , 2.5 , 3.3 L ? There is a in line fuse for the fuel pump near the relay ! There are four relays front right of engine compartment mounted on radiator support cross member . The one for fuel pump is the one on the inside . Fuse is near there an there is a connector not connected to anything ,this is for fuel pump prime . Jump battery voltage to it a see if it runs then ! or replace relay !

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It must have a short in the wiring to the pump, the trick is to find it.

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Turn the key to the ON position without starting the engine. You should hear the fuel pump running for 5 seconds if working. This primes the gas to the injectors when doing this. If not heard running check the oil pressure switch for the 12 volts needed to run the fuel pump starts there on that harness. When the engine starts and the oil pressure reaches the normal pressure the computer shuts off that circuit and turns on the fuel pump relay to run the pump. The relay stays on till you shut the engine off

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I have a 1990 f150. we dont get any power to the


well you need to check the fuel pump relay first there is no reset switch

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2 Answers

1990 ford f150 it wont start


first off check wires to fuel pump with a light tester if you are getting power then you may have ECM or faulty pump or crossed wires

May 02, 2009 | 1990 Ford F150

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if the relay is clicking its working the fuel pump is the problem!!!

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check your ground to the ecm..the ecm controls all the relays

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