burning up fuel pumps
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Senior User
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From: Erie Pennsylvania
burning up fuel pumps
My buddy's 87 F-250 6.9 has an electric fuel pump on it that bypasses the mechanical pump. He keeps burning up the electrical fuel pumps (gone through 3). Does anybody know why? I told him to check the ground but he says that is good. I also thought that the electric fuel pump has to be on whenever the engine is running. However, he says he has been driving it around for a few days without and electric fuel pump turned on or the mechanical pump. Is this at all normal?
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TheBlueMule
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TheBlueMule
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Joined: Sep 2007
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From: Las vegas
Thats wierd the only thing I could think of that would let it run is the transfer pump in the injection pump is able to suck up the fule wich probly isn't very good for it. Is the electric pump designed for diesel?
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From: Erie Pennsylvania
Originally Posted by George D.
Thats wierd the only thing I could think of that would let it run is the transfer pump in the injection pump is able to suck up the fule wich probly isn't very good for it. Is the electric pump designed for diesel?
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TheBlueMule
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Joined: Nov 2004
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From: Manitoba
Are we to understand he has both pumps installed and the electric some how bypasses or goes through the manual lift pump. There should only be 1 pump installed, manual lift or electric...... one should be removed. There is a blockoff plate available for the manual lift pump hole........"chebby big block fuel pump blockoff plate"
i ain't rite
Joined: Mar 2005
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From: Marlboro Mental Hospital.
Originally Posted by TheBlueMule
The pumps he has gotten say for gas/diesel applications I guess. It recently burned up the origional pump that has been on the truck for 7+ years, and has gone through 2 in the last week. He also just recently broke his ignition switch and installed a push button starter but I can't see where this would interfear with an aftermarket add on electric fuel pump. I am clueless as of why they keep burning up and how it still starts/runs, unless it is the transfer pump in the IP.
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TheBlueMule
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TheBlueMule
check to see if the pump powers off when the engine is shut off.
i bet the electric pump is always powered, and this is causing it to overheat and die.
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Joined: Apr 2006
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From: houma, louisiana
are maybe there is a blockage in the return lines. and its causing a strain on the pump and burning it out.
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From: Erie Pennsylvania
Originally Posted by tjc transport
this is a big clue as to the electric pumps burning out.
check to see if the pump powers off when the engine is shut off.
i bet the electric pump is always powered, and this is causing it to overheat and die.
check to see if the pump powers off when the engine is shut off.
i bet the electric pump is always powered, and this is causing it to overheat and die.
He says he can easily tell when the pump is on and the truck isn't running, because he can hear the pump working...unless it is burnt up.
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i ain't rite
Joined: Mar 2005
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From: Marlboro Mental Hospital.
yes, that is what i meant. the clue to me that the pump is always powered on is that the old pump lasted for 7 years, but burnt out after he broke the ignition switch, and it went through 3 pumps in 1 week after breaking the switch.
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From: Erie Pennsylvania
I have an idea now on what could be happening. He said his batteries drain down when it sits for a while, and when he gives it gas the volt meter rockets up to 18. He has the pump tied right into the battery. Do you think a bad voltage regulator would cause the truck to overcharge enough to burn up fuel pumps? Makes sense to me but what do you guys think?
Thanks
TheBlueMule
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TheBlueMule
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From: houma, louisiana
yes you could say if it had a bad voltage regulator it could cause it to overcharge and also cause it to drain all the juice out of the batteries also. when you say that its wired directly to the batteries, meaning that its not on a keyed source then that could be your battery drain and the reason for the pump to burn up because its running all the time. please elabarate on the directly wired to the battery.
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From: Danville, Pa
Originally Posted by TheBlueMule
Do you mean the pump is in the on position and the pump is pumping while the engine and truck are shut off?
He says he can easily tell when the pump is on and the truck isn't running, because he can hear the pump working...unless it is burnt up.
He says he can easily tell when the pump is on and the truck isn't running, because he can hear the pump working...unless it is burnt up.
If all other things aside, I think this sounds like the pump is burning out,... Because of lack of voltage. Electric motors generate much more heat when under powered, versus over powered. Most of the time when overpowered, they have a mechanical failure, vs winding break down. If indeed the power comes strait from the battery, but the ground goes to the frame, I would run another wire strait to the neg battery post. Also, is polarity correct?
Instead of constant speculation on the issue, what whe need from you, The BlueMule, is a timeline of events. What fuel pumps he burned up, and replaced with. As well as their original condition, and specs.
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From: Erie Pennsylvania
Originally Posted by LilDuke
This tells me the pump is prob wired to a switch. If he burned up 2 pumps in consession, my question is... Were they new to begin with? Is the ground going strait to the frame? Is the pump too small/large for the application.
If all other things aside, I think this sounds like the pump is burning out,... Because of lack of voltage. Electric motors generate much more heat when under powered, versus over powered. Most of the time when overpowered, they have a mechanical failure, vs winding break down. If indeed the power comes strait from the battery, but the ground goes to the frame, I would run another wire strait to the neg battery post. Also, is polarity correct?
Instead of constant speculation on the issue, what whe need from you, The BlueMule, is a timeline of events. What fuel pumps he burned up, and replaced with. As well as their original condition, and specs.
If all other things aside, I think this sounds like the pump is burning out,... Because of lack of voltage. Electric motors generate much more heat when under powered, versus over powered. Most of the time when overpowered, they have a mechanical failure, vs winding break down. If indeed the power comes strait from the battery, but the ground goes to the frame, I would run another wire strait to the neg battery post. Also, is polarity correct?
Instead of constant speculation on the issue, what whe need from you, The BlueMule, is a timeline of events. What fuel pumps he burned up, and replaced with. As well as their original condition, and specs.
Thank you all
TheBlueMule