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Fuel Pressure ...... PSI
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Nevada View Drop Down
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    Posted: Aug/29/2014 at 10:46am
Hello,
Anyone know what the PSI requirements are for the Holley One Barrel Carb. ? .... 1961 rambler , 196 c.i. , Auto Trans.
I think my fuel pump needs rebuilding.

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Points: 1247 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Snotty Quote  Post ReplyReply Direct Link To This Post Posted: Aug/29/2014 at 12:08pm
According to Chilton's Auto Repair Manual 1954-1963, that would be 4.5 psi across the board, regardless of motor.
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Points: 3953 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rocklandrambler Quote  Post ReplyReply Direct Link To This Post Posted: Aug/29/2014 at 12:23pm
Per '65 American TSM pressure specifications are 4 lbs minimum to 5 1/2 lbs maximum at 500 rpm.
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Points: 3942 		Post Options Post Options   Thanks (0) Thanks(0)   Quote carnuck Quote  Post ReplyReply Direct Link To This Post Posted: Aug/29/2014 at 12:28pm
make sure it's not just crud in the inlet of the carb
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And crud can collect in the check valves of the fuel pump too.

The fuel pump is pretty simple to take apart and clean, some have a built in fuel filter that rarely gets changed.
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Sometimes even after rebuild the pump pressure can be too low. Pressure is regulated by the diaphragm spring, and that spring gets weak with age.
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Points: 89 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Nevada Quote  Post ReplyReply Direct Link To This Post Posted: Aug/30/2014 at 12:04pm
Thanks everyone. Yea, I rebuilt the carb. this past winter/spring,               and I put in new fuel lines and cleaned out the tank.
Then I bled the system into an old gas can with a electric fuel pump in case I missed anything.
Guess I'll have to rebuild the original fuel pump (I was only getting 3 PSI from the original pump) or just use the electric pump.

Thanks .
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Points: 9061 		Post Options Post Options   Thanks (0) Thanks(0)   Quote pacerman Quote  Post ReplyReply Direct Link To This Post Posted: Aug/30/2014 at 12:35pm
There's a carb rebuilder who posts youtube videos of his work several times a week.  He always recommends a fuel pressure regulator to limit the pressure to 3 psi for carbs because the ethanol-laced gas has different properties then the fuel these carbs were designed for.   He says the modern fuel has made the original fuel pressure specifications obsolete.  If you're only "problem" is the 3 psi pressure that's probably adequate and you won't need to rebuild your pump.  Joe
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