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Fuel Pump Replacement?

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Old Sep 30, 2017 | 08:32 PM
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Default Fuel Pump Replacement?

Forum: Looks like my SB fuel pump has died. It is very old.
Is there something better than stock I can use?
Possibly something aftermarket is possible?
Not ready for an elect just yet.

TIA

R
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Old Sep 30, 2017 | 08:48 PM
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Originally Posted by Taijutsu
Forum: Looks like my SB fuel pump has died. It is very old.
Is there something better than stock I can use?
Possibly something aftermarket is possible?
Not ready for an electric pump just yet.

TIA

R

They may be available from Chevrolet Performance Parts but all of the Corvette-only vendors should stock them.
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Old Sep 30, 2017 | 08:50 PM
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For one thing, a new pump has to be a three port. Not the easiest to find, but do-able.
Hard to beat a good ol' GM though.
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Old Sep 30, 2017 | 09:03 PM
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Originally Posted by HeadsU.P.
For one thing, a new pump has to be a three port. Not the easiest to find, but do-able.
Hard to beat a good ol' GM though.
I wasn't aware there was a three port pump? Doesn't the 432 fuel filter (if I remember the part # correctly) simplify the OP's search by providing a return path with a conventional pump.

Last edited by ignatz; Sep 30, 2017 at 09:17 PM.
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Old Sep 30, 2017 | 09:22 PM
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Originally Posted by ignatz
I wasn't aware there was a three port pump? Doesn't the 432 fuel filter (if I remember the part # correctly) simplify the OP's search by providing a return path with a conventional pump.
Mine has 2 ports. A rubber line coming in and a short hard line to the carb.
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Old Sep 30, 2017 | 09:22 PM
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I believe its:
Inlet
Outlet
By-Pass or return

If you only have two, then you can use about any aftermarket unit.

Last edited by HeadsU.P.; Sep 30, 2017 at 09:23 PM.
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Old Sep 30, 2017 | 10:09 PM
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There is a third port that is blocked at the factory.
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Old Sep 30, 2017 | 10:09 PM
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got one of these? The only need, so far as I know is to mitigate vapor lock

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Old Sep 30, 2017 | 10:26 PM
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Mine is straight up/down w/ports on the bottom facing front and I think side?
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Old Sep 30, 2017 | 10:29 PM
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Originally Posted by ignatz
I wasn't aware there was a three port pump?
My 81 has one. I don't recall what year that started. Maybe 78?
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Old Sep 30, 2017 | 10:30 PM
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Originally Posted by 71VetteLover
They may be available from Chevrolet Performance Parts but all of the Corvette-only vendors should stock them.
Rock Auto stocks Delco.
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Old Sep 30, 2017 | 10:36 PM
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OP has a 74
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Old Oct 1, 2017 | 01:06 PM
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Now I have to find a way to take out the third bolt up higher on the FP!
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Old Oct 1, 2017 | 01:22 PM
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You mean on the mounting plate? F.P. only has two bolts, plate has four. There is no need to remove the plate unless its leaking oil.
I have a one foot long - 3/8" drive extension that makes quick work of reaching the F.P. bolts. Some people take off the right front tire to access. Don't forget the pushrod bolt to help you on the front of the block.
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Old Oct 1, 2017 | 01:48 PM
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Easy job, just a little messy.

No reason to use anything other than a stock replacement pump.
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Old Oct 1, 2017 | 01:54 PM
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I was taking off the plate. Eek
The two bolts holding it on are too close to body to get a wrench or socket on it properly.
Not to mention the bolts seem stuck.

I'm taking a break, I will try again later.

Thanks
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Old Oct 1, 2017 | 01:57 PM
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In shopping and comparing mech FP. The cheap ones are rated at 5-6 gph and the good pumps are rated higher.
Looks like you get what you pay for.
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Old Oct 1, 2017 | 03:30 PM
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Originally Posted by Taijutsu
I was taking off the plate. Eek
The two bolts holding it on are too close to body to get a wrench or socket on it properly.
Not to mention the bolts seem stuck.

I'm taking a break, I will try again later.

Thanks
Go slow. You Do Not Want To Break a Bolt Down There! PB Blaster would normally work but that is a blind hole. Can't use heat next to a fuel line.
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Old Oct 1, 2017 | 05:53 PM
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Default Worst comes to Worst?

Originally Posted by HeadsU.P.
Go slow. You Do Not Want To Break a Bolt Down There! PB Blaster would normally work but that is a blind hole. Can't use heat next to a fuel line.
If I can't get the bolt to move. I'm tempted to try and break the FP into pieces? lol

R
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Old Oct 2, 2017 | 05:58 PM
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If you install a pump that has MORE than 5-6 psi, you'll more than likely get a host of other problems- like the float, needle and seat won't be able to control the fuel coming in and flooding the engine.

There are 2 bolts, 9/16 head that hold the pump to the block, and 2 7/16 head bolts that hold the plate to the block. With a/c, about the only way in there is thru the wheel/inner fender or from under the car.

FWIW: that little factory fuel pump supported the 3x2 carbs on the 427/435hp, and the L-88's as delivered from the factory.
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