[gtorich]

Sorry for the stupid post, i bought a pump few years back, was supposed to only have 4-5 lbs fuel pressure for my tripower, of course i cant find any paperwork on it............so what are you guys using for a 66 with tripower for the fuel pump.

Brand and numbers would be great.

If it helps any, i heard you could have 3/8 hole on the mounting holes, mine are 5/16


Rich

[Goatracer1]

Some timing cover have 3/8 and some 5/16. If pump has 3/8 it will work on either.

[gtorich]

Thanks Goatracer...........i double checked mine i have the 5/16 holes, was looking at the delco 40373........seems backordered most places, the other one is a carter M 4507.....as i said i cant remember what i have, but its at least 7-8 yrs old, thought since everything else is new, might as well get that.

Rich

[Goatracer1]

Rock Auto has the Carter for $16.40. if you are interested discount code of : 229357924208978840 is good until May 19, 2023.

[ftwmlp]

I purchased the Carter M4507 for my 66 389 with AFB. Installed and used to break in engine on run stand, but no actual street use at this time.

[gtorich]

Originally Posted by Goatracer1

Rock Auto has the Carter for $16.40. if you are interested discount code of : 229357924208978840 is good until May 19, 2023.

Thanks Goatracer, now were talking about that price................i usually roll with the "Buy high, sell Low..........will get that one.

Rich

[madeuce50]

For what it's worth......
The Carter M4507 pump is rated at 6 to 6.5 psi, some folks would say a bit high for tri power set-ups.

[gtorich]

Originally Posted by madeuce50

For what it's worth......
The Carter M4507 pump is rated at 6 to 6.5 psi, some folks would say a bit high for tri power set-ups.

Thats why i asked my original question...........i cant find the number for the one i ordered, but thought it was at 5 psi at the highest.............never had any issues with that one.....................im just wondering if i should just use that pump even though it has a few years on it...........

Rich

[428ho4spd]

NOS GM... https://www.ebay.com/itm/314535520762

[Goatracer1]

If it's NOS the diaphragm will be old and possibly dried out. Also it won't be compatible with today's gasoline with alcohol in it.

[wbnapier]

I have my tripower at 3.5 psi.

I use a regulator I bought at PontiacTripower.com

https://pontiactripower.com/products...431642e8&_ss=r

[428ho4spd]

Originally Posted by Goatracer1

If it's NOS the diaphragm will be old and possibly dried out. Also it won't be compatible with today's gasoline with alcohol in it.

I've been using NOS pumps for years without any issues. I would much rather take my chances with NOS over the new crap they're selling today. And you'll know the pressure is correct, problem solved.

[Goatracer1]

You know nothing about a 50 year old pump until it fills your crankcase with gas.

[60sstuff]

Originally Posted by Goatracer1

If it's NOS the diaphragm will be old and possibly dried out. Also it won't be compatible with today's gasoline with alcohol in it.

This is the NOS fuel pump I installed in 1991 on my ‘66 GTO that I had just purchased.
Ran perfect then and still runs perfect.

I have another boxed 40373 on the shelf, as you can’t beat an OEM part.

Just sayin.

[Goatracer1]

A fuel pump that old was NOT designed for today's alcohol diluted fuel so even if it's parts were still good when you installed it they will fail.

[lust4speed]

If you use an old NOS pump make sure your insurance is up to date.

I would run a pressure test after installing any fuel pump.