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May 12, 2008 | 12:24 AM

hollenjoe

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Traitor question

Hey I know, i have also an efi 460 in a truck, obiuosly not a 335, im haveing trouble with an electrical fuel punp thats located on my gas tank, i checked for short circuits and i dont let it pass below a 1/4 tank, so any ideas why i have fried 6 of these expensive craps¿ thanks

May 12, 2008 | 12:49 AM

todd31277

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Joined: Oct 2004

Posts: 212

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From: Beaver, Ohio

water in gas? plugged fuel filter. bad reg. have you checked fuel pressure ? where are you buying them from

May 12, 2008 | 07:16 PM

JBradley500

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Joined: Jul 2006

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From: America

todd, really nice job on your '88...

i mean that, if you really did that transformation, that truck got re-born.

May 12, 2008 | 07:41 PM

danlee

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Joined: Aug 2001

Posts: 4,270

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From: Delaware

Quote:

Originally Posted by hollenjoe

Low Voltage! A DC electric motor will draw more current as the voltage goes down. It's the current that fries the fine wires in the pump. So you need to be sure that it has good connections to 12 volts and ground. Voltage drops across any resistance are the enemy. It can be in the ground circuit as well as the supply circuit. Check your wiring and especially the connections, including that crummy ground connection with all the dirt on it.

Check the pump voltage at the pump feed wires with pins while the pump is running.

May 12, 2008 | 08:07 PM

hollenjoe

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Thanks , Im gonna get my hands dirty tomorrw on this.. Ill let you know how it goes..

May 12, 2008 | 08:13 PM

danlee

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Joined: Aug 2001

Posts: 4,270

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From: Delaware

Quote:

Originally Posted by hollenjoe

Thanks , Im gonna get my hands dirty tomorrw on this.. Ill let you know how it goes..

Don't blow yourself up. Work in a well ventilated space, like outside, and check for fuel leaks before you make a spark. It's too late to check after.

May 13, 2008 | 05:06 PM

todd31277

Senior User

Joined: Oct 2004

Posts: 212

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From: Beaver, Ohio

Quote:

Originally Posted by JBradley500

todd, really nice job on your '88...

i mean that, if you really did that transformation, that truck got re-born.

really is the same truck. ask my wife she took care of our 3yr twins by herself for 5 months. (:

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May 15, 2008 | 08:35 AM

palmrose2

Tuned

Joined: Sep 2003

Posts: 348

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From: Northern Michigan

Quote:

Originally Posted by danlee

I have to admit that I'm not the biggest Ford man but MANY vehicles have a relay in the pump circuit to give the pump 12 volts while the key is in the "start" position. Once key is released to "run" position, 6 volts is sent to the pump. My understanding is that the pump will last longer running @ 6 volts as opposed to 12. Kind of like a set of points in an old dizzy. If it's always running @ 12 volts maybe that would explain the short life.

Having said this, in my experience, most bad pump relays will run the pump with the starter engaged and start the vehicle until the key is released to the run position and the pump gets NO voltage.

I would at least check into it and see what voltage is supposed to be there at different times.

One more thing. I know that a standard AC motor will draw more amps as voltage drops but was under the impression that DC motors simply slowed down with voltage drop. I'm pretty sure that's what the rheostat that controls the heater motor on our autos does.