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Discussion Starter #1
I have one of these fuel pumps fitted to the engine in my 82:




But it's got a crack in it and I want to replace it. I'd rather go with a smaller unit, but don't feel the need for a "high performace" job, just another standard pump will be fine. Will one of these pumps be ok?



If so, do they have the 3rd (return?) fitting on them? Sorry for the dull question but my 82 Shop Manual doesn't cover this type of fuel pump!
 

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I have one of these fuel pumps fitted to the engine in my 82:




But it's got a crack in it and I want to replace it. I'd rather go with a smaller unit, but don't feel the need for a "high performace" job, just another standard pump will be fine. Will one of these pumps be ok?



If so, do they have the 3rd (return?) fitting on them? Sorry for the dull question but my 82 Shop Manual doesn't cover this type of fuel pump!
I have to assume with that olde style mechanical pump, your '82 was changed over to crab, instead of injection.....the factory had it set up with electric pump in the tank....removable from top of tank under the lid...

so if you indeed DO have a carb, the smaller one on the second pix will work fine....about 20 bux or less on this side.....

OH, edit....for the return line fitting...yes....should use it...



:cheers:
 

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Discussion Starter #3
I have to assume with that olde style mechanical pump, your '82 was changed over to crab, instead of injection.....the factory had it set up with electric pump in the tank....removable from top of tank under the lid...

so if you indeed DO have a carb, the smaller one on the second pix will work fine....about 20 bux or less on this side.....

OH, edit....for the return line fitting...yes....should use it...

:cheers:
Yep, already carb'd up (before I bought it). Does the pump in the second pic have the return line fitting? Can't see in the pic...
 

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GM did make smaller pumps with a return back in the 60s and 70s. Dan't remember what applications.
You will have to try another application like a camaro, nova etc.
Try emailing Ironcross, he has had a parts store forever and knows his stuff.

The other alternative is to install a metered tee or return regulator between the pump and carb, but using the return is a good idea.:D
 

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Wayne,
That's just a standard pump used on Impalas, Camaros, pickups, etc. They are available with or without the return line.
Mike
 

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Dumber question #2..where do those 3 lines route to??? I know one is the source from the tank. And another is the pressure line to the carb. Is the third one a pollution line or what???

Dumb Dep
 

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Dumber question #2..where do those 3 lines route to??? I know one is the source from the tank. And another is the pressure line to the carb. Is the third one a pollution line or what???

Dumb Dep
It's a return to the tank- excess fuel gets sent back to the tank for another try at making the big show.

:cheers:
 

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if you are worried about making a return line then i guess you could block it, but if you already have one then use it. it gets rid of stress on the pump by returning fuel that is not being used- ie: your RPM's are high but the throttle is not all the way open, not using all of the fuel being pumped by the pump. when the fuel is just sitting there with the pump trying to push it out, it makes it harder for your cam to operate the pump.
in simpleton terms, it creates unnessesary stress if you dont have one.
 

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if you are worried about making a return line then i guess you could block it, but if you already have one then use it. it gets rid of stress on the pump by returning fuel that is not being used- ie: your RPM's are high but the throttle is not all the way open, not using all of the fuel being pumped by the pump. when the fuel is just sitting there with the pump trying to push it out, it makes it harder for your cam to operate the pump.
in simpleton terms, it creates unnessesary stress if you dont have one.

What HE said and also, some years ago, olde Pontiac, I had the expereience of blocking the return line and the pump had enough peak pressure to flood the carb, knocked that float seat right outta there, and kept on pissing....

shocker to see....fuel all over the engine/intake.....

I dunno what the earlier pumps did to eliminate that problem, all I know is IF you have a return line USE it....

it's the 1/4 inch line, the 3/8 hose is input from fuel line on frame rail...the 3/8 flare is to the carb....

years ago I just used a hose barb and ran 3/8 fuel line with a clamp on it, because the stock fuel lines had a habit of welding themselves to the flare nutz and would twist the entire line around in a spiral crimp trying to get it off....car after car, I"d just cut the damn steel lines and do with a hose....

must have run cars over 30 years that a way, with CARBS now, NOT FI....

:devil: :devil: :cheers:
 

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Wouldn't a pressure regulator solve the problem the same as that return line?
 

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Can that line be plugged???? I mean is it really necessary?
Why not just use a pump without the return line provision ? Peace,,,Moosie :buhbye:
 

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Why not just use a pump without the return line provision ? Peace,,,Moosie :buhbye:
Well you CAN, IF you can find a pump for a early 60s vechicle.....that one change damn nearly forced the two line pumps being hard to find at one point.... you block that 1/4 inch return line and watch what happens to the carb....it's funny, really....

I think some of that is due to taking lead outta gas in the mid 70's...and cars preparing for the change over....about '69? or so they went to 3 lines...

jeebus....I wuz in my 20's then, .....

:WTF :crazy: :thud:
 

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Discussion Starter #16
ACDelco 41216
Thanks Mike, that's exactly what I wanted! What would the size of the outlet fitting be? 1/2 x 18?

Thanks again guys, I really appreciate the help :thumbsup:
 
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