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Return Type Fuel System issue- Line Size? #1805215 04/16/15 09:12 PM 04/16/15 09:12 PM
Joined: Dec 2004 Posts: 1,548 DC, MD Suburbs 440PURSUIT OP pro stock
440PURSUIT OP pro stock Joined: Dec 2004 Posts: 1,548 DC, MD Suburbs	Anybody care to speak about Line size for Feed vs Return? Carbureted 440 6bbl. I have a Magna Fuel 285 picking up dual lines from welded in lower sump though #8. #8 Up to Aeromotive Regulator with #6 return. I cannot get the Fuel pressure below 12 at the regulator. This is bench testing before car has started. I have since heard that the return must be equal or bigger than the feed. Thoughts....Help??? 1969 Hemi Charger R/T, 1970 Charger 472 Hemi 6 Sp 1969 Charger Pro Tour Project 1971 Barracuda Convert 1970 440 6pack Superbird, 1968 Fury I Police Pursuit 440 Super Commando 2 door sedan (Black/Blue) 1967 Barracuda Convert 1968 Barracuda Coupe 1972 Charger w 383 1972 Sebring Plus 440-6 Clone 1969 Coronet Pro Street 2009 Challengeer SRT8 stick 1992-1986 Body 2500 4x4 440 stick 1982 Ramcharger 318 Sniper- getting enhanced. 1997 Ram B3500 Van 5.9 1991.5 W250 Cummins- Big Chief

Re: Return Type Fuel System issue- Line Size? [Re: 440PURSUIT] #1805219 04/16/15 09:17 PM 04/16/15 09:17 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	If the return is a restriction it will show up as pressure on the return side, put a gauge on it and that will answer your question. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: Return Type Fuel System issue- Line Size? [Re: Supercuda] #1805228 04/16/15 09:29 PM 04/16/15 09:29 PM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	Agree... that is a big pump and the return is probably restricting it so much it won't regulate. I have similar line sizes on an EFI setup... it won't regulate below about 15 PSI but OK because normal pressure is 45 psi. I guess the return would need to be at least as big as the supply in your setup. One fix, besides a bigger return, may be a smaller pump.

Re: Return Type Fuel System issue- Line Size? [Re: 440PURSUIT] #1805230 04/16/15 09:33 PM 04/16/15 09:33 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Don't forget that, for a given diameter, the longer the line the more restrictive it is. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: Return Type Fuel System issue- Line Size? [Re: 440PURSUIT] #1805377 04/17/15 12:54 AM 04/17/15 12:54 AM
Joined: Dec 2004 Posts: 1,548 DC, MD Suburbs 440PURSUIT OP pro stock
440PURSUIT OP pro stock Joined: Dec 2004 Posts: 1,548 DC, MD Suburbs	Good Stuff.... Drove me crazy cuz I spent a bunch on $$$ plumbing. I will just attach an 8 or 10 to return and let in dump in a can and see what I get. 1969 Hemi Charger R/T, 1970 Charger 472 Hemi 6 Sp 1969 Charger Pro Tour Project 1971 Barracuda Convert 1970 440 6pack Superbird, 1968 Fury I Police Pursuit 440 Super Commando 2 door sedan (Black/Blue) 1967 Barracuda Convert 1968 Barracuda Coupe 1972 Charger w 383 1972 Sebring Plus 440-6 Clone 1969 Coronet Pro Street 2009 Challengeer SRT8 stick 1992-1986 Body 2500 4x4 440 stick 1982 Ramcharger 318 Sniper- getting enhanced. 1997 Ram B3500 Van 5.9 1991.5 W250 Cummins- Big Chief

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