64 / 394 fuel pump w/o AC - Return line
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Joined: Mar 2015
Posts: 249
From: Denmark
64 / 394 fuel pump w/o AC - Return line
Hi ClassicOldsmobile
On hot summerdays, slowing down from ex 60 mph to city driving 30-40 mph and a with a few stoplights enginetemp gets higher and of course under hood temps gets higher too. I begin to feel less fuel is available, and finally the engine stalls. This is the scenario I experienced during the summer of 2023.
Would it be possible to drill and tap a fuel return outlet on my none return fuel pump?
I thought of this instead of going for a electric fuel pump, with fuelpressure reg. and return, but is it sufficient to have the return at the pump instead having the return closer to the carburetor ex. on the carburetor fuel feed line?
Some sort of restriction or smaller dimension return line would be needed to keep the pressure in the fuel line.
On hot summerdays, slowing down from ex 60 mph to city driving 30-40 mph and a with a few stoplights enginetemp gets higher and of course under hood temps gets higher too. I begin to feel less fuel is available, and finally the engine stalls. This is the scenario I experienced during the summer of 2023.
Would it be possible to drill and tap a fuel return outlet on my none return fuel pump?
I thought of this instead of going for a electric fuel pump, with fuelpressure reg. and return, but is it sufficient to have the return at the pump instead having the return closer to the carburetor ex. on the carburetor fuel feed line?
Some sort of restriction or smaller dimension return line would be needed to keep the pressure in the fuel line.
Thread Starter
Registered User
Joined: Mar 2015
Posts: 249
From: Denmark
Correct, I have not checked fuel pressure. Only reason for not checking the fuel pressure is simply the behaviour of the car.
My guess work is based on what I see examening / taking fuel lines in the engine bay apart confirming more or less no fuel is present, and testing the fuel delivery with steaming hot engine and after a while slightly cooler engine, combined with the very almost timed behaviour, not from time to time, but every time I am/the car is in the mentioned situation.
I can push the car on the highway doing 80-90 mph, and accelerate from there without fuelstarvation or other issues.
I also have a removed and cleaned fuel tank, inspected pickup, rather new rubber hoses, the very few pieces that is there,
I can add the steel fuel line from pump to carb has been cut and replaced with rubber hose almost all the way from pump to carburetor, if that should matter.
all of that made me think if would be worth doing. If it would not have the desired effect, I would still have a return style fuel supply 😊
My guess work is based on what I see examening / taking fuel lines in the engine bay apart confirming more or less no fuel is present, and testing the fuel delivery with steaming hot engine and after a while slightly cooler engine, combined with the very almost timed behaviour, not from time to time, but every time I am/the car is in the mentioned situation.
I can push the car on the highway doing 80-90 mph, and accelerate from there without fuelstarvation or other issues.
I also have a removed and cleaned fuel tank, inspected pickup, rather new rubber hoses, the very few pieces that is there,
I can add the steel fuel line from pump to carb has been cut and replaced with rubber hose almost all the way from pump to carburetor, if that should matter.
all of that made me think if would be worth doing. If it would not have the desired effect, I would still have a return style fuel supply 😊
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