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Jul 21st, 2025 | | | | Joined: Apr 2008 Posts: 643 'Bolter | | 'Bolter Joined: Apr 2008 Posts: 643 | 58gmc 1/2ton truck GMC302 9:1 compression, Clifford Intake& Clifford Headers, Tom Lowes modified 4barrel Holley.
What psi electric fuel pump do I need? I have one put puts out around 4psi but have read that 8psi is better?
Thanks
Danny
1958 GMC stepside GMC 302 six cylinder 3 speed OD trans
| | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | If you run an adjustable pressure regulator with a return line to the tank, you will be able to dial in the correct pressure for your one-off application.
Running a return line will also keep fuel running through the fuel lines, preventing vapor lock.
Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | Is the fuel pump lobe on your camshaft worn out?
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Apr 2008 Posts: 643 'Bolter | | 'Bolter Joined: Apr 2008 Posts: 643 | Is the fuel pump lobe on your camshaft worn out?
Jerry No cutout for mechanical pump on my military engine
Danny
1958 GMC stepside GMC 302 six cylinder 3 speed OD trans
| | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | As long as your pump can put out at least a pint of fuel into a catch container in 30 seconds, you have plenty of volume to run the engine. Extra pressure just increases the danger of flooding and fire. Be sure the pump circuit is wired through an oil pressure sensing switch to keep it from filling the crankcase with gasoline in case of a stall.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jan 2008 Posts: 4,903 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,903 | The military cam has a lobe for a fuel pump and the block has a boss for a fuel pump, but no hole. It used to be common to cut a hole and tap for bolts using a fuel pump gasket. But I even retrofit civilian engines with electric fuel pumps because I don't like mechanical fuel pumps. When a fuel pump fails on a GMC, it is quite common for it to squirt gas on the cam and wash the lubrication. I set me fuel pumps at around 4 psi. Thats all I need and it relieves a lot of strain on the needle and seat. The only fuel pump for 6 volt that I have been able to find lately is a Carter which puts out about 8 which I consider to much. Facet, which I prefer no longer makes 6 volt, but they do make a 12 volt at around 4 psi. | | | | | Joined: Apr 2008 Posts: 643 'Bolter | | 'Bolter Joined: Apr 2008 Posts: 643 | Fuel pump installed.
THANKS !
Danny
1958 GMC stepside GMC 302 six cylinder 3 speed OD trans
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