Stock fuel pump specs.

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Stock fuel pump specs.

Postby Astre-mutt » Mon Mar 24, 2008 7:05 pm

Could anyone tell me the GPM of the stock 76 Astre fuel pump?
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Postby gt350fme » Wed Mar 26, 2008 11:05 pm

Don't know this one, but if your pump is good, or not, filter is clean, you could disconect a fuel line and place the hose into a clean 5 gal container, jump the pump for 1 minute and see what you get.
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Postby spencerforhire » Thu Mar 27, 2008 6:42 am

I'm not sure of the exact GPH rating, but I know from experience that it's not enough to feed a V8. I never bothered to try an OEM Monza pump to see if it would work any better; in the last 3 swaps I did I used a Holley 110 GPH blue pump(with a pressure regulator).
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Postby gt350fme » Thu Mar 27, 2008 11:56 am

For my v-8 fuel needs, I have read that an intank camaro fuel pump of similar design will do the trick on the street, some fabrication is required, but I will manage.
The v-8 Monza pump may work as well.
I also have a old Mallory 110 that I could use but they sure are noisy, trying to keep my car quiet, some owner's probably don't care about that, just food for thought.
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Postby SunbirdMan » Thu Mar 27, 2008 12:23 pm

I recently replaced my in-tank pump with a Napa pump(factory V8 ). The specs says 15 gph. Man, I hope my float bowl holds enough for a quarter mile WOT. Let's see, I think that comes to 1/2 pint every 15 seconds. That should be enough, right?
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UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
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Postby heinz057 » Thu Mar 27, 2008 12:26 pm

as long as it's down hill
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Postby gt350fme » Thu Mar 27, 2008 1:51 pm

Just some rough math, at .5 pint per 15 seconds = 2 pints a minute or .25 GPM, your 15 GPH pump = .25 GPM, barely enough fuel at WOT, granted it can get past the float valve at that rate, Hmmmm probably not.
1964 Chevy panel K30
1973 GT Vega Hatchback
1977 Chevy K20
1984 944 porsche
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Postby Astre-mutt » Thu Mar 27, 2008 3:20 pm

I was wondering if the stock pump would work or not. I only have a V6, but the other day I open it up hard for the first time. I had to modify the carb linkage because I wasn't getting full throttle. When I tested it out I ran it up hard in first gear. Just before it shifted to second it almost shut down. I checked my float level. Both the secondary and primary was low. But definitely not getting enough fuel to keep up with the engine demands.
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Postby gt350fme » Fri Mar 28, 2008 7:32 pm

Do make sure that fuel filter is good, that could restrict flow.
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Postby Astre-mutt » Fri Mar 28, 2008 9:24 pm

I installed a in-line fuel filter when I change the Rochester to a Holley. It's one of these rebuild-able glass filters. You can watch it fill up like a doctors syringe. ( and Doc's a little slow ) I was going to have to replaced the fuel system eventually anyways. Just seams strange my stock V6 could use that much gas. I mean this thing just shut down at it's max RPM. No spiting or sputtering. I got off the gas quick. Then gave it a little gas a couple times to see if it was still running , and it was. Had no more problems since. But I haven't had a chance to really test it since. ( To much law around here ) But it sounds like fuel right?
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Postby heinz057 » Fri Mar 28, 2008 9:36 pm

be carfull with that glass filter i have seen more than enough break and cause a fire because they are not mounted correctly
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Postby gt350fme » Fri Mar 28, 2008 10:24 pm

Could be fuel related, sometimes intermitant problems can drive you nuts, you have to confirm whats good, then look at other systems.
Then if the filter is for sure good, you do need to make sure you have adaquit presure and flow in GPM from the hose going to the carb through the filter, never asume or it may be missed, although your applacation may different, my vega years ago had a high speed fuel starvation issue, side draft webber, drove me nuts, had good flow in GPM, can't remember what that was now, so I figured that wasen't the problem, didn't check pressure, after much flustration I finally discovered the little short hose inside the tank between the pump and the fuel line was cracked and losing pressure when the system was all hocked up, changed that hose and all was good in the world again, just food for thought.
1964 Chevy panel K30
1973 GT Vega Hatchback
1977 Chevy K20
1984 944 porsche
1992 Lexus SC 400
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Postby Astre-mutt » Sat Mar 29, 2008 11:36 am

I was thinking about pressure. That's why I was hoping someone had the stock specs. If it isn't more then 2 or 3 pounds then I could see where the fuel flow could suffer under acceleration. Even with a stock V6 the car pulls hard in first. The car has 3.73's, and even with the 17" wheels the tires are only 24.5" tall.
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Postby gt350fme » Sat Mar 29, 2008 1:08 pm

OK, I found some info for the 71-75 Vega, L4 should have 3-4.5 psi at 12.6 volts,
V8 should have 7-8.5 psi at 12.6 volts, and deliver about one pint every 30-45 seconds for both, I would assume most other carburated engines would be similar in needs, of coarse EFI would need much higher PSI, hope this helps even though its not specific to the 76 V6, I would think 4-6 psi for OE would be in the range.

I also have used those filters with the glass sight tube with no problem but indeed you would not wont the glass bumping on something.
1964 Chevy panel K30
1973 GT Vega Hatchback
1977 Chevy K20
1984 944 porsche
1992 Lexus SC 400
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Postby Astre-mutt » Sat Mar 29, 2008 2:51 pm

Thanks John, that helps a lot. My car would be the L4 fuel pump. The motor is a stock GM 1985 4.3L, not original to my car.
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