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
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"All right baby, see what I´ve got right here in my hands, I´ve got it right in my hands to score you baby, I think im gonna yank on a one town! Look Out!" Uncle Ted
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
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.
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Thanks , Im gonna get my hands dirty tomorrw on this.. Ill let you know how it goes..
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"All right baby, see what I´ve got right here in my hands, I´ve got it right in my hands to score you baby, I think im gonna yank on a one town! Look Out!" Uncle Ted
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.
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.
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1979 F250 2wd 351 All original 70,000 miles
Thank you very much, It it was a bad wire and a bad negative.... Any ways just to be sure i rewired the whole thing....
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"All right baby, see what I´ve got right here in my hands, I´ve got it right in my hands to score you baby, I think im gonna yank on a one town! Look Out!" Uncle Ted
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