Fuel pressure 12psi

[Coolair]

My fuel pressure is running at 12 would like to get around 3 or 4 I heard you can cut the fuel pump spring any feedback would be great

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[Coolair]

This is an old fuel pump I dissected

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[notched]

Yes you can try cutting the spring but I have found some of the newer pumps will not come down much. What I have done is swap in a spring from an old OEM AC Delco pump.

[Coolair]

It's an ac delco pump I just don't know how much to cut and the spring is cone shaped may be a little from top and bottom

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[bbodie52]

If you have two fuel pumps you could simply try transplanting the spring from the old fuel pump you dissected into the active pump (without cutting it). The different spring may be all that is needed to reduce the fuel pressure down to the desired level.

[Coolair]

I will give it try getting good at taking things apart numerous times and putting it back together

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[notched]

The "new" AC Delco pumps are NOT the same as the original AC Delco pumps. They are just like the Airtex or Spectra pumps.
When I said AC Delco, I meant one of the OEM original AC Delco or similar.

[toytron]

I wonder if there is a way to fatigue the new spring in one of the center coils?

Ed Stevenson

[Coolair]

How do you tell if it's oem original ac delco

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[Coolair]

Success so my original psi was actually 7 don't no why I put 12 anyways I cut two coils of the top that got me down 5 than I cut a quarter more iam at 3 1/2 now which is great because my venturi is not dribbling anymore still need to get these carbs rebuilt

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[64powerglide]

Probably just need a float adjustment. So now when your driving at highway speed is the pump going to keep up with demand?

[Coolair]

I hope so there is a lot of fuel coming out the line I was told that newer fuel could increase the pressure and I was running at 7 psi now iam in between 3 and 4 venturi is not dribbling float is set to spec carbs are a mess getting sent out for a rebuild

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