ole 86

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Oct 13, 2007 | 04:38 PM

macm

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ole 86

Newbie here.Well,I found the fuel relay,it was bad, bought new, installed, pumps hum. How hard is it to test the pressure of the fuel rail? Do I do it at the tire valve looking thing or what? Oh, 86 f 150 EFI 5.0.

Oct 13, 2007 | 07:43 PM

beaners1

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Yes the schrader valve is where you test the fuel pressure but a tire pressure guage does not work, you need a fuel pressure tester.

Oct 14, 2007 | 06:35 AM

macm

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ole 86

That's what I thought. I just saw the schrader valve and didin't know what it was called. So, Does anyone know if Auto Zone has a fuel pressure tester?

Oct 14, 2007 | 10:36 AM

macm

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ole 86

Well, I think I've narrowed it down to maybe the fuel pressure regulator, if that's what's mounted on the fuel rail on drivers side, towards the fire wall. Now I need to find out how to check. When I relieve the pressure at the schrader valve it's air, but it's under pressure. I'm thinking I'm not getting fire to the intank pump. Anybody???

Oct 14, 2007 | 06:38 PM

302 F-150

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Pull the vacuum line off the regaulator and if there is gas in it your regualtor is bad

Oct 15, 2007 | 04:57 PM

macm

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ole 86

There was no gas from the vacuum line to the regulator. Need to find out if I have power to in tank pump. I guess lay under tank when ignition is turned on to see? I have a test light, anything I can check for power with it?

Oct 17, 2007 | 12:02 PM

302RP

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From: Wills Point, TX

The tank has a connector going to it with four wires, pull back the sleeving and you will see a red wire (hot) orange wire (ground from actual pump) black wire (chassis ground) and last wire I think was blue w/yellow (fuel gage wire). Shave off some of the insulation from the red wire and check if you have power with your test light or you can run a ground wire and hot wire from your battery to see if pump is good and actually kicks on or not. remember red is hot and orange is ground. good luck!