Elec. fuel pump psi
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Freshman User
Joined: Mar 2005
Posts: 35
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From: Denver, Co
Elec. fuel pump psi
Hello,
If my 250 spec. is for 4.5-6.5 psi fuel pump pressure,
and I install a 5.5-9 psi rated electric fuel pump that pumps through
the mechanical pump,
will I create any problems?
I expect to only use this elec. pump in case of mech. pump failure.
Thanks, John
If my 250 spec. is for 4.5-6.5 psi fuel pump pressure,
and I install a 5.5-9 psi rated electric fuel pump that pumps through
the mechanical pump,
will I create any problems?
I expect to only use this elec. pump in case of mech. pump failure.
Thanks, John
Posting Guru
Joined: Nov 2004
Posts: 1,111
Likes: 0
From: Turlock CA
The problem in your case may be, will the mechanical pump draw thru the electric?
I used to run a AC brand electric pump on my 68 for just that reason. When the mechanical would start giving me problems I would kick on the electric. The AC style is a cheap electric pulse style pump. If you used a good Holley electric they are rotory and I don't think the mechanical will draw thru it.
Just my .02 worth.
I used to run a AC brand electric pump on my 68 for just that reason. When the mechanical would start giving me problems I would kick on the electric. The AC style is a cheap electric pulse style pump. If you used a good Holley electric they are rotory and I don't think the mechanical will draw thru it.
Just my .02 worth.
Elder User
Joined: May 2006
Posts: 909
Likes: 0
From: QLD Australia
it shouldent unless your float is just really weak, or your stopper pin is wore out (the thing that looks like a torpedo in the carb, not sure of its technical name)) .
I ran electric pump on my bug with dual carbs with no prob, as well as a mustang with carb. never had a problem with too much flowing. thats just 2 of the cars iv ran electric fuels on carbs. there have been many more.
I ran electric pump on my bug with dual carbs with no prob, as well as a mustang with carb. never had a problem with too much flowing. thats just 2 of the cars iv ran electric fuels on carbs. there have been many more.
Elder User
Joined: May 2006
Posts: 909
Likes: 0
From: QLD Australia
hmm, I would run a dedicated wire for it from a key'd fuse or some other power source. i would use a relay if it were me.... about any power source will become active at the same time as the coil if its keyd.
it will be able to "pressurize" the fuel line, but the prime its self comes from the accellerator pump on the carb when you press the gas. unless your talking about the gas making its way back up to the carb, then it would with electric fuel pump.
im not sure which fuse or power source would be the best to work from, but I dont know that I would run it from the coil wire. I would almost think the oil sending unit would be a lower voltage, but am not 100% sure about that part. personally iv not checked the oil sender for voltage, but I know on the gauge side they are reduced to something like 5 or 6 volts. im sure some of the experts will chime in on this soon..
it will be able to "pressurize" the fuel line, but the prime its self comes from the accellerator pump on the carb when you press the gas. unless your talking about the gas making its way back up to the carb, then it would with electric fuel pump.
im not sure which fuse or power source would be the best to work from, but I dont know that I would run it from the coil wire. I would almost think the oil sending unit would be a lower voltage, but am not 100% sure about that part. personally iv not checked the oil sender for voltage, but I know on the gauge side they are reduced to something like 5 or 6 volts. im sure some of the experts will chime in on this soon..
Posting Guru
Joined: Nov 2004
Posts: 1,111
Likes: 0
From: Turlock CA
I agree with Rick.
Run a dedicated circuit with a switch and connect to a source that runs from your key switch so that when you shut the truck down you kill the fuel pump.
My dad used to run a electric fuel pump on this 65 until one morning while waiting to here the electric fuel pump come up to pressure he filled two cylinders with gas and when he tried to crank it broke some piston rings. That is when this 352 got it's overhaul.
Run a dedicated circuit with a switch and connect to a source that runs from your key switch so that when you shut the truck down you kill the fuel pump.
My dad used to run a electric fuel pump on this 65 until one morning while waiting to here the electric fuel pump come up to pressure he filled two cylinders with gas and when he tried to crank it broke some piston rings. That is when this 352 got it's overhaul.
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Cargo Master
Joined: Feb 2004
Posts: 2,060
Likes: 167
From: Central Texas
I fail to see the point in doing any of this. In my 24 year driving career, I've had 1 mechanical fuel pump die, but have replaced 2 electric pumps.
A backup system is nice, but why stop with the fuel pump. Why not plumb in 2 ignition systems, 2 alternators, 2 water pumps, 2 batteries, etc?
A backup system is nice, but why stop with the fuel pump. Why not plumb in 2 ignition systems, 2 alternators, 2 water pumps, 2 batteries, etc?
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Thread Starter
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Freshman User
Joined: Mar 2005
Posts: 35
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From: Denver, Co
I had heard the new fuel mixtures cause early failure on the old Ford mechanical fuel pumps and that was one reason I considered the elec. pump idea. Maybe that's not really the case. I appreciate all the ideas. THANKS
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