Fuel Pump Pressure 64 Tri Power - Pontiac GTO Forum
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post #1 of 5 (permalink) Old 03-02-2019, 10:51 AM Thread Starter
 
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Fuel Pump Pressure 64 Tri Power

Buying a new Fuel Pump.
Are there any issues with Fuel pump pressure of 8 PSI vs standard 6 PSI for Tri-power for 1964?
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post #2 of 5 (permalink) Old 03-02-2019, 11:43 AM
 
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Originally Posted by fredm389 View Post
Buying a new Fuel Pump.
Are there any issues with Fuel pump pressure of 8 PSI vs standard 6 PSI for Tri-power for 1964?
Only if the carb floods over and catches the engine on fire and burns the car down.

This has been covered a number of times here. Use the Google custom search feature in the upper right corner and you will find a number of discussions on the subject.
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post #3 of 5 (permalink) Old 03-04-2019, 07:33 AM
 
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Originally Posted by fredm389 View Post
Buying a new Fuel Pump.
Are there any issues with Fuel pump pressure of 8 PSI vs standard 6 PSI for Tri-power for 1964?
Yes you don't want to use 8 psi or even 6 psi (the original pumps were not a constant 6 psi). If you get the 8 psi mechanical pump, just buy a regulator and set it to 4 psi and you should be fine.
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1965 GTO Convertible 3 speed tri-power drum brakes originally

Current setup:
400 cu in with tri-power
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post #4 of 5 (permalink) Old 03-04-2019, 05:15 PM
 
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Originally Posted by cij911 View Post
Yes you don't want to use 8 psi or even 6 psi (the original pumps were not a constant 6 psi). If you get the 8 psi mechanical pump, just buy a regulator and set it to 4 psi and you should be fine.
Factory fuel pump is rated as 5-6 1/2 PSI @ 1000 RPM's.

With AC, and probably due to the loss of pressure from the return line, 3-5 1/2 PSI @ 1000 RPM's

Flow volume is measured as 1 Pint in 30 seconds @ idle.

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post #5 of 5 (permalink) Old 03-04-2019, 08:06 PM
 
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Smart advice,...I run an electric fuel pump gauge in the cab,....really letís you see what is going on. I am using an edelbrock fuel pump that is 6 PSI. I got tat specifically because it has a strong casting, I donít need a regulator....but I do run a return line to the fuel tank from the carburetor.

That return line has an 060 orifice that keeps fuel cool up to the carb and always moving. That with idle drops the pressure to 5 1/2 at idle.

At 75 mph 2500 RPMís steady 5 PSI,....PSI does properly drop some when a little more throttle is given at lower RPMís 4 maybe.

Pressure is resistance to flow,....so you can watch as you go.

temperature has a small effect on fuel pressure as well, the viscosity of liquids is effected by temperature. So just like your motor oil is thick when cold and thinner when hot,...I have noticed the same on the fuel but much slighter. About 1/2 pound. Cold fuel is 1/2 PSI higher than hot fuel....you can see it on the fuel gauge.

I do wrap my fuel lines with DEI fire sleeve which keeps them cool and helps a lot of ways.

That Edelbrock fuel pump has stong flow works good.
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