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#4092048 - 01/16/21 08:14 PM Basic 75 Fuel Pump Question
ericp Offline

Registered: 02/19/08
Posts: 61
Loc: pa, usa
Hi all, basic question. One of my carbureted Fords is a 75 Continental with the 460. I noticed while doing an oil change that I have a return line from the fuel pump heading back to the tank. Is this a form of emission control or a way to stop vapor lock? I also noticed that I have an AC brand filter. I’m guessing that the previous owner installed this as it looks aftermarket. Just wanted to check up on why this return line is there. It is nice to be able to try to keep these nice classics on the road. Thanks!

#4092104 - 01/17/21 07:16 AM Re: Basic 75 Fuel Pump Question [Re: ericp]
Old_Guy_Stu Offline

Over the Hill

Registered: 04/28/19
Posts: 1925
Loc: Cleveland, OH
The return line keeps the float bowls from overflowing due to overpressure in those rare instances when a 460 isn't guzzling fuel. The fuel pump has enough capacity to keep up with fuel demand at full throttle, but it's dumb, doesn't know what the demand is. The return line is a way to smarten up the system a little.

If you're replacing the fuel filter, a transparent one isn't a bad idea. Lets you see when rust is becoming a problem.

1988 CVLX Formal Roof (Love Boat) POTM July 2019 & Aug 2020, 55K
E-code lights w/ relays, LEDs w/ switchbacks, 15x8 Ansen slots w/ 255/60 BFG's, Kenwood stereo, various hacks.
1988 CVLX (Destroyer) 1998-2001 driven to death 202K
1988 Squire (Chris Craft) 1996-1998 junkyard rescue driven to death 199K

#4092136 - 01/17/21 01:30 PM Re: Basic 75 Fuel Pump Question [Re: Old_Guy_Stu]
ericp Offline

Registered: 02/19/08
Posts: 61
Loc: pa, usa
Thanks! I thought it might be to prevent vapor lock. P.S. I also doubt that engine can get too much gas but it sure is smooth!


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