manual to electric fuel pump - Chevy Nova Forum
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Old 10th-January-2017, 11:03 PM   #1
vics63

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manual to electric fuel pump

On a carbureted engine if I switch from a mechanical fuel pump to an electric fuel pump will I need to add a return line to the fuel tank if I don't currently have one. Or, do some electric pumps have a built in pressure regulator that starts and stops the flow as needed?
Victor
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Old 10th-January-2017, 11:51 PM   #2
Roddychop

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Yes there are a variety of in line electric fuel pumps that unload on their own when the float bowl is full. Usually you only need a return line to the tank if you are running EFI.

Why do you want electric ? I've never liked them because they sit there and groan if you have the key on without the engine running. You don't notice the noise when the engine is running.
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Old 10th-January-2017, 11:58 PM   #3
Roddychop

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It can be simple as this. You may need to modify your fuel lines depending on where you want to mount it.

http://www.jegs.com/i/Holley/510/12-427/10002/-1
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Old 11th-January-2017, 12:03 AM   #4
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electric fuel pump

You dont have to run a return line. It depends on the system you choose. I use an Aeromotive Street Strip "SS" series with their Dead head regulator.
You can contact Aeromotive through their website...

RD
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Old 11th-January-2017, 01:03 AM   #5
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Originally Posted by Roddychop View Post
I've never liked them because they sit there and groan if you have the key on without the engine running.
Put a normally open oil pressure switch in the control for the FPR and it won't start the pump until your engine has oil pressure.
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Old 11th-January-2017, 01:48 AM   #6
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I had an electric fuel pump on my 72 with no return line and it seemed to work alright. It was there when I bought the car. No matter what I did to the mount it made a noticable racket back there.
The electric pump is in the scrap bin and a nice equally functional, quiet mechanical pump will replace it.
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Old 11th-January-2017, 02:07 AM   #7
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Had a Stewart Warner elec fuel pump on my car for years. Could barely hear it running standing beside the hood with engine off. Have had others that would shake the car and thump more than a lumpy cam!
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Old 11th-January-2017, 03:37 AM   #8
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I'm not committed to putting in an electric. Just considering the possibility. Wanted to understand how they regulated the pressure and couldn't find the answer I was looking for just searching electric fuel pumps. So if a pump is rated at 4 to 7 psi as the one from Jegs is, then it stops pumping when it reaches 7 psi? Why would you still hear it with the key on and engine not running. Seems like it would be just a quick blast to pressurize the line since the bowl's should already be full.
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Old 11th-January-2017, 07:56 AM   #9
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All of the electric pumps that I have used never cut off as long as the switch is on. The max pressure they can put out is in the range of 4 to 7 lbs so they run and hold that pressure no matter how much flow is needed.
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Old 11th-January-2017, 09:02 AM   #10
bracketchev70

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The small electric pumps are internally regulated and bypass internally when the pressure exceeds output pressure. The electric motor does not cycle on and off.
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Old 11th-January-2017, 09:04 AM   #11
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I wish I had a choice but with my block I gotta use electric pump.
I don't care for the noisy thing.
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Old 11th-January-2017, 09:11 AM   #12
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Quote:
Originally Posted by Roddychop View Post
Yes there are a variety of in line electric fuel pumps that unload on their own when the float bowl is full. Usually you only need a return line to the tank if you are running EFI.

Why do you want electric ? I've never liked them because they sit there and groan if you have the key on without the engine running. You don't notice the noise when the engine is running.
I put mine on a switch after keyed power so I can listen to tunes or the pump itself without engine noise.
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Old 11th-January-2017, 12:52 PM   #13
vics63

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Originally Posted by bracketchev70 View Post
The small electric pumps are internally regulated and bypass internally when the pressure exceeds output pressure. The electric motor does not cycle on and off.
Thanks for all of the input. This was the information I was curious about.
If I do go to an electric pump I would definitely go with some type of switch, perhaps like Mike suggested.
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