Question about 1988 Ford F 150

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Which one is the fuel pump relay. I am not getting any power to the rail fuel pump. is there anyway to tell the difference between the fuel pump relay and ecc relay?

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Swap them out they are the same one, they are the exact same relay so switching them wont hurt anything, that's the best way to see what the problem is

Posted on Sep 13, 2010

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How do I drain the fuel tank


I can tell you several things and will add a few things because I do not know why you want to drain the tank.
A Part called an Inertia switch will interrupt the power to the fuel pump if it is tripped. It has a Reset button and depending on your Year Grand Marquis, the part is in the trunk next to the Air suspension. Your pump may be good.
Clogged fuel pump. There is a plastic screen which is on the fuel pump pick-up. It can disintegrate and clog the pump. Blow air into the fuel rail test port to shed the screen fragments back into the tank. Then try the next paragraph.
Working pump with Low pressure. You can remove 2 things to pump out the gas.through the fuel rail. The test port on the fuel rail has a valve similar to an air valve stem. Removal of the valve seat from the test port allows you an open line to drain the tank.
Go on the internet and find the procedures for jumping the fuel pump relay switch. The relay is in a black box which is piggy-backed on a Powerbox on the Drivers side of the engine compartment. The top of the piggy-back has 3 relays and a diode labeled and the trio slide out of the compartment by releasing some retaining snaps protruding out of the case.
If you look under the relay there will be numbers by the contacts. I want to say that #27 and #34 are the two to be jumped. I may have the wrong numbers or your Year car may be different.
One pin is a power source-the other goes directly to the fuel pump. With the ignition ON, placing a wire between these two contact holes will power your fuel pump.
Have a hose clamped on the fuel rail test port which you removed the needle seat from and put the hose end into a gas can.
I pumped close to 17 gallons of fuel from my 2002 Grand Marquis in a short time.
The gas tanks have baffles. I tried 3 different hose sizes and could not get one to pass the baffles. The fuel filter disconnect can be a problem, especially with fuel pressure. So the easiest way to drain the fuel is through the test port.
You can also siphon through the port with a hand drawn pump.
Please rate my info.

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How do you know fuel pump is bad, is there anyway it can be checked?


Well you use a fuel pressure gauge to check pressure at the injector rail, and you can check for power and ground at the gas tank to make sure the pump is running.

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1 Answer

I have a 1985 toyota pickup 4/4 that is not geting spark to injectors or any fuel to fuel rail how do i solve this?


That may be two different problems. Or not.
You may have a relay problem that feeds power to the pump and the injectors but I doubt it.
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2000 grand am. replaced relay, fuse, and fuel pump. still is not getting fuel to fuel rail. 5 volts is present at fuel pump but not 12 volts to run pump. reset passlock.....still do not have 12 volts at...


Pull the relay and make sure you have 12 volts there. Pin # 30 is the power to the pump. this will tell you which way you have to go to find a short or corrosion in the wires. let me know
Randy

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I HAVE 89 16 VALVE Turbo that wont start. Turns over< have spark at all cylinders, New fuel pumps and filter but no fuel in the fuel rail! Fuse is good, only thing left is the Relay??


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1997 GMC Jimmy has no power to the fuel pump. Is


fuse in the fuse box. also the power to prime the pump starts at the oil pressure switch. check that out too. then the relay for the pump in that order

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The fuel pump is not pumping the fuel.


Is the fuel pump actually coming on??? If it isn't, I would start by checking for a fuel pump relay.  This is usually located up in the engine compartment in a black box on the drivers side.  Relays are small black boxes approx 1"x1".  These have a tendency to go out just like fuses.  Also double check your fuses.  If you suspect a that a relay is bad, you can interchange them with other relays that look the exact same to see if they really are the problems.  These relays are very quick and easy to change and are very cheap.  They usually run no more than $10-15.
Any further questions, feel free to ask.

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