Electric boost pump?
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Electric boost pump?
During the week my 78 Bronco sits and is not started. When I start it on the weekends, it has to turn over several times because the gas has drained back, and evaporated from the carb.
Can I install an electric fuel pump near the tank to act as a boost pump, and still run the mechanical pump? I would have it switched and turn it off once the engine starts. Will gas still flow thru the electric pump, even though it's turned off? And will gas flow thru the mechanical pump when the engine is off? Thanks.
78 Bronco Ranger XLT, 351M, 4 speed, Trailer Special
Can I install an electric fuel pump near the tank to act as a boost pump, and still run the mechanical pump? I would have it switched and turn it off once the engine starts. Will gas still flow thru the electric pump, even though it's turned off? And will gas flow thru the mechanical pump when the engine is off? Thanks.
78 Bronco Ranger XLT, 351M, 4 speed, Trailer Special
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Joined: Dec 2000
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From: Racine WI
Electric boost pump?
I dont think gas will flow thru either a rotor type or diaphram type fuel pump, so you would have to keep it on all the time....I dont think it will flow thru but I have been wrong before.
Gas shouldnt drain back over a weekend I wouldnt think, maybe there is a check valve built into the fuel pump or you could possibly install a check valve inline right after the tank
Gas shouldnt drain back over a weekend I wouldnt think, maybe there is a check valve built into the fuel pump or you could possibly install a check valve inline right after the tank
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Joined: Jul 1999
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Electric boost pump?
We use a diaphragm type booster pump on one of the trucks at the VFD I am a member of. We switch the pump on to fill the carb then start the truck. We turn the pump off when running with no problems. Todays gasolines have such low boiling point fractions that the stuff dries out or flashes off? during hot weather.
Hope this helps ..
TomC
Hope this helps ..
TomC
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Joined: Jul 2001
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From: Gainesville, FL
Electric boost pump?
Ranger,
You are describing a leak in your fuel line. A leak will allow fuel to return to the tank when it sits for even a short time. Evaporating fuel from a carb should take much longer than a week. Smell the oil dipstick and see if it stinks of fuel. If it does, the fuel pump diaprham is leaking fuel into your crankcase and the pump probably is a slow pumper, to build a pressure to the carb. It's a long shot, but what the hell. An electric fuel pump is a good option if your racing or drive a Porsche. But for a ford truck, it's abit excessive. Mechanical pump will pull through an electric pump and an electric pump can pump through a mechanical, FYI. Mechanical check valve works in one direction only. If the check valve failed your pump would not work at all.
Good Luck, Have Fun,
KingFisher
You are describing a leak in your fuel line. A leak will allow fuel to return to the tank when it sits for even a short time. Evaporating fuel from a carb should take much longer than a week. Smell the oil dipstick and see if it stinks of fuel. If it does, the fuel pump diaprham is leaking fuel into your crankcase and the pump probably is a slow pumper, to build a pressure to the carb. It's a long shot, but what the hell. An electric fuel pump is a good option if your racing or drive a Porsche. But for a ford truck, it's abit excessive. Mechanical pump will pull through an electric pump and an electric pump can pump through a mechanical, FYI. Mechanical check valve works in one direction only. If the check valve failed your pump would not work at all.
Good Luck, Have Fun,
KingFisher
Post Fiend
Joined: Sep 2000
Posts: 8,238
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From: Oregon
Electric boost pump?
I researched this very topic extensively awhile back, it turns out quite a few racers run an electric in tandem with their mechanical. They all told me that a mechanical will draw through an electric even if its not engaged. I don't see why you would need to do this, but I thought I would share what I found out.
http://www.cavernsofblood.com/41kf/skulls/ANIskullBluFire3.gif '72 F-250 "Hi-Boy" 4x4, Dana 60/HD44, FE428 @ 400+ ponies , NP435 4-speed, custom suspension w lift, mud on black.
http://www.cavernsofblood.com/41kf/skulls/ANIskullBluFire3.gif '72 F-250 "Hi-Boy" 4x4, Dana 60/HD44, FE428 @ 400+ ponies , NP435 4-speed, custom suspension w lift, mud on black.
