What electric in-tank fuel pump?

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What electric in-tank fuel pump?

Postby 77 Spyder » Sun Jul 30, 2006 8:56 am

Anyone know of a fuel pump, that can be installed to replace the oem version in the tank? I was thinking maybe the 3rd generation f body version that was carbed. 82-87 ish?

I would prefer to not mount one under the car, or under the hood, if I don't have too. A mechanical version will fit, but I am now sure if anyone is running that.

Thanks
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Postby cjbiagi » Sun Jul 30, 2006 9:59 am

Why not just get a new one for a Monza?
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Postby 77 Spyder » Sun Jul 30, 2006 10:23 am

cjbiagi wrote:Why not just get a new one for a Monza?


I do have the stock unit in working order.

Will that keep up with a modified Small block?

It was years ago, but the 77 I had back in the 80's, came with a 305, & I dropped in a 350 slightly built, with a quadrajet.
It ran out of fuel after 4500 RPM's

I just assumed the stock fuel pumps would supply enough volume.
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Postby marco_1978_spyder » Sun Jul 30, 2006 12:09 pm

Sometimes stock fuel pumps work well and other times they dont.

I have the stocker in my '78 and it keeps up with a holley 600 dbbl pumper. -mid 15 sec car.

Other stock pumps I have seem to have troube keeping up.

I think the actual pump is somewhat universal.

The one that went dead on my spyder had a larger opening and looked more heavy duty all around than the factory unit.

I do believe there are some better alternatives.
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Postby cjbiagi » Sun Jul 30, 2006 1:50 pm

I don't know, I have used the stock style pump on my 350 for over 20 years, never had a problem. I suppose it depends on how long you are running it at these higher rpm's. For normal short blasts through the gears it seems fine, if you are going to have long runs at that rpm level it may be a different story. Be aware that there are 4 cylinder pumps and V8 pumps.
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Postby therick215 » Sun Jul 30, 2006 8:26 pm

You know I never thought of that. That there was a 4 cyl pump and a 8 cyl pump. That would probably explain why a 300 hores 327 we had in a vega would run out of fuel on us in first gear when you were winding it out. we then put that engine in a 262 Moza and it worked great. We figured the pump in the Vega was going bad. Rick
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Postby gerbsinmd » Mon Jul 31, 2006 9:21 am

If you are having problems at around 4500 rpm, I would check for sufficient air intake first. My dad was having the same prob with his 383 and thought that it was fuel. It turned out to be an air supply problem. He made a custom, ram air, type air cleaner but was only using a 2 in tall air cleaner, it turns out that he didn't have enough space over the top of carb to draw in the air that it needed.

Take the air filter off and do a quick run to see if you still have the problem.

Darrel
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Postby 77 Spyder » Mon Jul 31, 2006 9:31 am

gerbsinmd wrote:If you are having problems at around 4500 rpm, I would check for sufficient air intake first. My dad was having the same prob with his 383 and thought that it was fuel. It turned out to be an air supply problem. He made a custom, ram air, type air cleaner but was only using a 2 in tall air cleaner, it turns out that he didn't have enough space over the top of carb to draw in the air that it needed.

Take the air filter off and do a quick run to see if you still have the problem.

Darrel


This was in a car I had back in 1985, ITs long gone, But it was a V8 car. From what I remeber, it would pull hard into the upper RPMs & then start to sputter. I puled the pump from the tank & installed a mechanical one. It never happened again.

Now I am doing a nut & bolt build on a 77 monza, But want to get it right the first time as I put things together.

Carl
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Postby Elfmagic » Mon Jul 31, 2006 12:00 pm

I have a stock style pump in my monza running a 750 with a three inch air filter, and only had the same problem when the pump started going out i checked pressure and it only had 2 lbs of pressure max. Replae the pump and has run great ever since! 8)
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Postby starfire383 » Mon Jul 31, 2006 8:45 pm

I had problems with the stock V8 pump supplying the moderate 383 in my starfire, not sure in-tank is something I'd mess with since an external pump is so much easier to deal with. The generic replacement internal pumps are notorious for only lasting 18 months anyway.

Running out of fuel at 4500 with a Qjet on a hipo motor is extremely common unless the factory needle and seat are upgraded. Qjets have tiny fuel bowls and a single inlet.

Good Luck!
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Postby cjbiagi » Mon Jul 31, 2006 8:49 pm

I am running a Carter AFB which seems to have pretty decent sized bowls. Maybe that helps?
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Postby cosvega76 » Tue Aug 01, 2006 7:15 am

I'm using a pump from GM Performance Parts that is for '82 - '87 carbed F-bodies. It is listed as part of the performance upgrade package. It requires a regulator, I use a good ol' Holley blue. I can dig up a part number later if you need one. It fits right in the tank where the Vega pump was.

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Postby Racin Jason » Sat Aug 12, 2006 1:40 pm

One thing i noticed while looking through the Chiltons on 71-80 GM subcompacts (H-body) was in the tune-up section it listed fuel pressure for all models. It varied, depending on engine size, year of engine ect. When I did my first 350 the fuel pump couldn't keep up. I installed a aftermarket electric pump just outside of tank. First run gas was gushing out of Q-jet accelator pump. Pulled fuse for factory pump and all was O.K. Later I put on a Holley 650cfm and put stock fuel pump fuse back in just to see what would happen. The car loaded up bad at idle, sounded terrible, but when I got to open her up it was like a whole new monster. Wish I could of left it that way. My guess was I was running about 15 psi. fuel pressure but the Holley took it. My point is that you should check your fuel pressure....Low pressure=Low performance.
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Re: What electric in-tank fuel pump?

Postby timbuk » Wed Mar 25, 2020 3:03 pm

DOES A STOCK MECHANICAL PUMP FIT IN A MONZA OR IS THAT WHY THEY ARE IN TANK ELECTRIC
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Re: What electric in-tank fuel pump?

Postby hammerdown7 » Wed Mar 25, 2020 6:40 pm

Other will chime in but I don't think there is enough room for a mechanical pump.

Dick
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