2nd Fuel Pump

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Jul 27, 2011 | 10:39 AM

Big-Hoss

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2nd Fuel Pump

i know where the high/low pressure housin is....now what i thought was the fuel filter is the 2nd fuel pump....if that has gone bad aslo then i still wouldnt be gettin fuel for her to start on her own right?...i need yall's help

Jul 27, 2011 | 01:31 PM

mrshorty

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From: UT

That's right, you need that high pressure pump on the rail to run to get adequate pressure to the injectors. Is the pump getting power? Ground? Is the pump running? I find these are easiest to test by grounding the fuel pump test lead in the self-test connector.

Jul 27, 2011 | 01:53 PM

Big-Hoss

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when i turn over the key i hear a click then nothing....so i do believe the fuel pump gettin power....now i have nothin to check it with so im goin into this whole problem blind folded.....were can i find the self-test connector?

Jul 27, 2011 | 09:59 PM

mrshorty

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From: UT

Quote:

when i turn over the key i hear a click then nothing....so i do believe the fuel pump gettin power

There's more than one relay that could be clicking, and a click by itself doesn't prove that the relay closed. I would verify power to the pump using a voltmeter.

Quote:

were can i find the self-test connector?

the self-test connector is under the hood, along the passenger side fender, near the air filter housing. Put "ford EEC-IV self-test into your favorite search engine and you should find several pages describing the self-test protocols, including where to locate the self-test connector. The fuel pump test lead is at the short leg of the trapezoid.

Jul 28, 2011 | 10:20 AM

Big-Hoss

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ok thnx...ill get on that asap...now how can i test the fuel pump is gettin power by the voltmeter?...and when i do the self-test connector wat do i look for? to kno its workin

Jul 28, 2011 | 12:52 PM

mrshorty

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From: UT

Quote:

and when i do the self-test connector wat do i look for?

Grounding the fuel pump test lead in the self-test connector merely tells the fuel pump relay to close. This allows for easier testing of the fuel pump circuit, by making it "always on" (as long as the key is on).

I think it was in my Chiltons manual for my Explorer that had a nice writeup/diagnostic chart on fuel pump testing. You might pull that up.

Quote:

now how can i test the fuel pump is gettin power by the voltmeter?

I'm guessing you're not very familiar with DC electricity. Basically, you put the positive meter lead to the power supply, and the negative lead to ground (any good exposed metal on the chassis should work). You'll want a wiring diagram to see what the circuit looks like.

The Haynes and Chiltons manuals used to include a short section on the basics of DC electricity (I expect something similar is online somewhere) and how to use a voltmeter. You might search around for such information. As electrically complex as modern cars are, it can be hard to do your own diagnosis without a basic understanding of electricity and how to use a meter.