Question about 1988 Ford F 150

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Fuel pump has no power test lighted the wires that runs to it no juice changed relay still got nothing

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  • htisha123 Jul 29, 2009

    check fuels already explain more about checking ignition switch

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  • Master
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If relay has no power to it, then try fuse or ignition switch wiring.

Posted on Jul 29, 2009

  • Nate Stansfield
    Nate Stansfield Jul 29, 2009

    Check each connection with the probes of a voltmeter or multi-tester for 12 volt current to the fuel pump relay.

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I have a 1996 Volvo 850 wagon I have no power to the fuel pump I even changed the relay still no power I use a test light as a fuel pump nothing I used the battery to jump the fuel pump still nothing


well first off you should get an initial 3-5 seconds fuel pump prime when you cycle the key. 1. check all fuses and switch the fuel pump relay with another one with the same number even if you replaced.. after this 2 have a friend turn the key to on and put your test light on the connector that goes into the pump and check for voltage (make sure to check all the wires just to make sure you have the right one for the 12v signal) (and make sure you have a good ground for your light) . If no voltage to the pump then you should verify that there is voltage to the relay with your test light (yank the relay two of the slots will be ground and two will be power,(most the time) **assuming its 4 prongs. Usually the relay clicks when u cycle it so thats an indicator its working as well, you can test relays with a 12v battery when its out of the fuse box or you can also open the case on it and manually switch the relay yourself. if you dont have voltage to the relay you should find a way to diagnose the ignition switch, if the switch is good then you should check all the grounds and wires running under the car and or to the ecu/ecm for burnt, frayed, crimped, or shorted wires, find a diagnostic flow chart run through it and at some point in that flow chart it will start pointing a finger at the ecu/ecm, can get one of these from the dealer if you ask nicely.
good luck also if the relay is clicking the ign switch is presumed ok
p.s. dont supply voltage to any wires or the pump. could simply blow a fuse or could do more damage such as fry an expensive ecu/ecm
sometimes signals are sent through ground and if you send a 12+ to it up in smoke it goes.

Jun 03, 2017 | Volvo Cars & Trucks

1 Answer

No power to fuel pump


If the old fuel pump failed, it may have blown a fuse or damaged a relay, so check those first. Your owner's manual should show where to find them. Usually, you can borrow a relay from another circuit for testing purposes.

Then, you need to determine if the wire from the engine compartment to the fuel pump is receiving power. A $3 test lamp with thin probes at each end should answer that question. While the engine is cranking, touch one end to what should be a "hot" connection and the other end to a good ground -- if the lamp lights, you've got juice.

If the wire has power, then check connections at the fuel pump that may have been mis-wired or come loose. If you have to remove the fuel pump to do this, hook it up directly (and briefly) to your battery to see if it runs ... even brand-new fuel pumps have been known to be defective.

If you're satisfied that the wiring, pump, connectors, fuses and relays are all OK, then the engine computer probably isn't activating the fuel pump relay for reasons best known to itself. Assuming the computer itself is receiving power (check fuses and relays), then you'll need to do some systematic electrical diagnosis, since there are many sensors that influence the computer's decision-making process.

Your best bet is to find an online forum for your truck. Since it's such a popular vehicle, there's likely to be many forums ... with other people who have encountered similar problems, and solved them. A factory service manual also may help to troubleshoot electrical problems.

Apr 11, 2014 | 2004 Ford F150

1 Answer

S10 truck "88" wont start change fuel elc pump,relay ,starter nothing


Have you tested the pump relay to see if it is sending power to the fuel pump ?

Mar 12, 2014 | Chevrolet S 10 Cars & Trucks

1 Answer

2002 Pontiac Grand Prix GTP not getting power to fuel pump


there may be some bad wireing in it that went bad or some thing i own a 2002 ponitac grand prix and it has power probums but i never see that one before but check the wireing

Mar 07, 2013 | Cars & Trucks

1 Answer

No fuel pressure, new pump


No fuel pressure means the pump is not running. Check the pump fuse and if it is good, find the pump relay and check for power going to it on the thick (red?) wire. If it has power there hook a meter or test light to the smaller power wire, have someone turn on the key while you watch the meter or light. It should read voltage for a few seconds.If that is good check the power wires going out from the relay to the pump. Same drill with the meter/light. If there is no power coming out from the relay it is a bad relay.

Oct 12, 2012 | 1996 Chevrolet S-10 Pickup

2 Answers

My 1999 Kia Sportage won't start. I checked the fuel pump while the key is on the ignition and I get the impression that it is not getting any juice. Fuel pump fuse is OK. Both cam and crank se


Well for starters, you need to diagnose the problem before replacing anymore parts. I say this because you mention both the fuel pump and sensors dealing with the ignition system which are 2 separate main things. Basically it takes 2 things to make an engine start, fuel and spark at the spark plugs. You need to narrow down what is missing because it seems since you replaced sensors dealing with spark and then you mention the other need fuel. I'm not sure as to where to start to help until whatever is missing is diagnosed and then find the cause of the loss. There are a couple of things you can check. Below is a picture of the relay box in the engine compartment. With the help of somebody put a finger touching both the fuel pump relay and the EGI main relay. While touching them have somebody turn the key to the "on" position (no need to try and start). When the key is turned on you should feel a "click" inside both of those relays. The fuel pump relay will click for about 3 seconds and the click again to shut off. The EGI main relay should stay on. If both seem to be fine you need to make sure of the fuel pump gettting "juice" and for power to the ignition system like the coils. You can get to the power/juice wire at the fuel pump pretty easy. You can access the connection at the fuel pump by lifting the lower part of the rear seat. Once the seat is lifted you should be able to see a part in the carpet that is cut to be able to lift the carpet up and access the plate covering the access to the fuel pump and/or the top of the fuel tank. Using a test light, check the green and yellow wires at the fuel pump. You should have power at those wire when turn the engine over or if the key is just turned to the on position you should have power there for about 3 seconds. To begin checking for spark or power to the ignition system you need to make sure you are getting power to the ignition coils. The red and white wires at the coils are your power wires. Check those. Also you can check the power at the fuel injectors. When the key is turned on or when trying to start, you should have power to the green wire at each of the fuel injectors. You should have constant power/juice at each of the fuel injectors. This is where I would start to narrow down the loss. Start here with these tests and let me know how the tests come out by replying/commenting here or you can email me directly at csautomotivecars@att.net ith what you have found out. Once the first tests are done and I know what the results are, we can go to the next step with a couple of other tests to figue the problem out. If one of the relays don't "click" then you have a possible bad relay. The EGI main relay is a common thing to go as well as the fuel pump relay. Don't mind helping and there is no cost to you for it but I don't want to tell you to start replacing parts until the problem is located. Hope this helps get you started.


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Apr 23, 2012 | 1999 Kia Sportage

1 Answer

I have a 1999 silverdao 1500 i have juice going to the fuel pump relay and no juice to the pump it wont start


The relay has power on 2 terminals not just one. the relay uses a smaller current to control a larger current...Apply 12 volts to the grey wire aka battery positive and see if the fuel pump will run. if it does ,Check all fuses. and check operation of the fuel ballance module.

Mar 17, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

99 Ford Windstar. Not getting any power to the fuel pump


first check the fuse if it is good then check for power at the relay

Jan 10, 2010 | 1999 Ford Windstar

2 Answers

1994 buick park avenue . driving home and shut off


how did you jump the fuel pump relay, by bypassing the relay or by applying power to contact that closes the relay? If you bypassed the relay completely you need to b ench test the relay you can do this easily by using any 12v dc power source. If you tested the fuel pump relay by applying power to the relay and the pump run and developed pressure. I suspect a wiring or ground issue. Good luck

Oct 07, 2009 | 1997 Buick Park Avenue

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