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11-30-2011, 09:29 AM
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#1 |
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Registered User
Join Date: Nov 2010
Location: Ottawa ON
Posts: 514
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Electric fuel pump questions??
Hey guys so I'm in the middle of my engine swap and now I'm at another road block. I need to use an electric fuel pump because the 1990 block I'm using doesn't have a casting for the mechanical (trust me I'd rather run one) After a search on here I still have a few questions.. To run my rochester q-jet I'll need around 5 psi correct? If I run an electric fuel pump do I need the return line?
How hard are they to wire up? And does anyone sell the entire kit with an oil pressure safety switch? How do you guys run your pumps?? Lots of questions I know! Here are some pictures of the swap so far. Pulled the van 350 first, pulled the truck 305 now I'm just cleaning and painting everything. |
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11-30-2011, 09:43 AM
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#2 |
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Registered User
Join Date: Dec 2010
Location: Pittsburgh, PA
Posts: 1,009
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Re: Electric fuel pump questions??
When my truck had an engine with the TBI block, we capped the return line and ran a pressure regulator for whatever carb I was running at the time. They're really easy to wire up. Wire it to where it has 12V when the key is on. If there is a way to keep it from coming on when the key is on ACC, do that (or just install a killswitch for whenever you need to use the electronics but don't want the fuel pump to run). Mine ran great, but prepare; if you mount yours on the frame rail, like I did, you will have the most annoying sound from the fuel pump echoing off the inside of your cab. It will drive you insane.
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Steve Member of the Foot Pedal Club '83 Chevy K20: 6" Rough Country, 3" Performance Accessories BL, Bushwacker Cutouts, 38x15.50 Mickey Thompson Baja Claws, 350 HP 350 crate engine from Jegs, Turbo 400 
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11-30-2011, 09:56 AM
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#3 |
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Registered User
Join Date: Nov 2004
Location: Long Island NY
Posts: 293
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Re: Electric fuel pump questions??
not to hijack but how beneficial is running an electric fuel pump to a carbureted engine? Im a novice....lol.
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I feel sorry for people who don't drink....because when they wake up in the morning, that's the best they're gonna feel all day long!---Frank Sinatra RIP [B]1972 Chevrolet K5 Blazer RIP 1986 GMC Sierra K3500 1TON, Long Box, V8350 RIP 1980 Chevy Silverado C30 Cab and Chassis, 454 TH400HD. RIP [B] 1995 Chevrolet Tahoe 2D [B] |
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11-30-2011, 10:11 AM
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#4 | |
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Registered User
Join Date: Dec 2010
Location: Pittsburgh, PA
Posts: 1,009
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Re: Electric fuel pump questions??
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__________________
Steve Member of the Foot Pedal Club '83 Chevy K20: 6" Rough Country, 3" Performance Accessories BL, Bushwacker Cutouts, 38x15.50 Mickey Thompson Baja Claws, 350 HP 350 crate engine from Jegs, Turbo 400
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11-30-2011, 11:23 AM
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#5 |
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Registered User
Join Date: Apr 2011
Location: corpus christi, tx - america's fattest city
Posts: 253
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Re: Electric fuel pump questions??
You need a 12V relay (to the control circuit side) tapped from the feed to your coil upstream from your fuel pump, this way the pump won't run when you have your key on ACC. Make a hot tap and dedicated fuse from your fuse panel for the power circuit for the fuel pump.
When you turn the key the 12V feed to your coil will energize the coil for the relay, closing the contacts on the relay and turning on the fuel pump. This is the correct way. |
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11-30-2011, 07:15 PM
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#6 | |
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The One And Only !!!
Join Date: Jan 2007
Location: Hole in the woods Florida
Posts: 4,567
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Re: Electric fuel pump questions??
Quote:
5 or 6 psi is fine, But it's always best to run a return line. This reduces back pressure which can reduce amp draw of the pump motor and the noisy cavitation associated with frame mounted pumps.
__________________
93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz !  The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. "Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
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11-30-2011, 10:54 PM
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#7 | |||||
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Dino burner
Join Date: Nov 2002
Location: Calgary, Alberta, Canada
Posts: 602
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Re: Electric fuel pump questions??
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Don't forget that electric fuel pumps are not very good at pulling fuel; they are designed to push. Therefore, mount the pump as low and as far back (right beside the tank if possible) in the vehicle as possible. Keep the amount of rubber hose you use to a minimum, and be sure to size all fittings, hoses and hose clamps properly. |
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