quadrajet heat soak

[hack_man]

Next time you let it sit,before you crank it pull off the air cleaner,look down the throat of the carb see if it's dry,it should be That's how I discovered the problem on mine,mine was soaked,I put a return style pump on and the problem went away.

When you installed a return style pump, did that mean you had to run another separate fuel line all the way back to the tank? Didn't that require dropping the tank and installing a different fuel tank sender with an additional port?

 

[Ricko1966]

When you installed a return style pump, did that mean you had to run another separate fuel line all the way back to the tank? Didn't that require dropping the tank and installing a different fuel tank sender with an additional port?

Yes you'd have to run a return line. My truck was already setup for a return style pump. But had a 2 port pump on it. It would flood commonly on a hot summer day parked. A lot of fighting with it and I figured out it was flooding due to fuel pressure sitting. I changed the pump to a return style and it was a miracle,the problem went away. I suppose,but do not know for fact, that you could run your return line back to close to the tank and return it into a tee at the main fuel line . That way the high pressure side could bleed off to the low pressure side parked. I'd run a serious restrictor in that tee.

 

[WFO]

its a 69 malibu, sorry I should have clarified, could it be possible small blocks didn't have a return, because I looked it over pretty closely and can't find any evidence that a return line was ever there, would not take much to add one

I'm thinking most Malibus don't have a return line.
If it has a smaller hard line along the frame, parallel to the main fuel line, then it does.

 

[Ricko1966]

its a 69 malibu, sorry I should have clarified, could it be possible small blocks didn't have a return, because I looked it over pretty closely and can't find any evidence that a return line was ever there, would not take much to add one

I think it depends on a couple of things one being what engine it came with new.

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[HotRodPC]

I've also seen tanks where there was no return line, but it did have a vent line with one of those 1 way covers of it. So you could take that cover off the vent port and connect your retun line there. Later vehicles with canister purge would have vent line back to the tank too. Was that like 1972 or so when that all started? However, purge canisters are only intended to capture gas FUMES and not liquid gasoline. Though it would seem to me, if you did it way back there at the tank, you could tap into that line. I wouldn't think what gaoline might return would be ablle to make it's way up to the canister behind the headlight. But there's also vacuum to the canister so maybe I'm smokin crack again and it could actually suck the gasoline into the canister and that would NOT be a good thing. In this case, I much doubt there's a purge canister. But surely, there's got to be a tank vent somewhere.

Could it work? Yeah, No? Otherwise, you'd have to get that part off a later model tank with the ports and also holds the fuel guage sending unit also. And if all else fails, just get a claw hammer and put a hole in the top of the tank, push the return into the hole and zip tie it so it don't fall out. Them smash some chewed up bubble gum around it. Bazooka seems to be much more sticky than Wrigleys soooo... FWIW !!!