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looseing prime in gas line
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george67
Novice
Sep 16, 2015, 12:29 PM
Post #1 of 11
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looseing prime in gas line
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hi ., could someone tell me why im looseing prime in my gas line . it empties the fuel filter out soon after you shut it down , lines ok ,not leaking . bought a new fuel pump , but ive had bad ones before new ., could this be my prob ? thx
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george67
Novice
Sep 16, 2015, 1:06 PM
Post #2 of 11
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Re: looseing prime in gas line
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also could this be the reason it backfires through carb ,and has no power ? at first when I take off ,its got balls then seemd to loose power its a 57 chev , 355 600 holly its not electric fuel pump, its a mechanical 7lbs psi , I belive or a little more
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kev2
Veteran
Sep 16, 2015, 1:07 PM
Post #3 of 11
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Re: looseing prime in gas line
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George- help us help you...
year, make, model, ENG, trans etc.
SWAG- leaking injector, fuel regulator, check valve. BUT knowing what vehicle will get a better suggestion.
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george67
Novice
Sep 16, 2015, 1:13 PM
Post #4 of 11
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Re: looseing prime in gas line
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57 chev belair , 355 ,was 350 .902 heads has cam 470 lift . edelbrock high rise 600 holly ., its like im running out of gas cause im loseing power
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kev2
Veteran
Sep 16, 2015, 1:13 PM
Post #5 of 11
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Re: looseing prime in gas line
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ok you added the info while I typed...
So an old carb setup...... float bowl leaking- needle and seat bad, stuck float, be sure fuel tank is vented, and oh yeah new does not mean good- shops use OEM parts for a reason comebacks are not a way to win repeat customers....
when holleys backfire the power valve often tears-
to be overly cautious - check engine oil for excess fuel-- to be safe.
(This post was edited by kev2 on Sep 16, 2015, 1:16 PM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 16, 2015, 1:14 PM
Post #6 of 11
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Re: looseing prime in gas line
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He said Kev2 = 1957 Chevy. OP - does this have a glass bowl fuel filter? I mean it! I ask because how would you know it's empty and that's what would be OE on many right then.
If it's been moved from it's original location and glass is on bottom with a bail holding it there it's boiling fuel out not drawing back. Idea is perfect on those as they show water and dirt at bottom without taking them off to clean them not replace.
Depending on what you should want to know it just hot and it could evaporate fuel but in some time not right away.
Rather than write a book on what to do tell us what set up it is,
T
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george67
Novice
Sep 16, 2015, 1:17 PM
Post #7 of 11
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Re: looseing prime in gas line
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I put a see through fuel filter on it .
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 16, 2015, 1:18 PM
Post #8 of 11
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Re: looseing prime in gas line
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Same thing - added info. If warm only that was common for vapor lock unheard of now. You may need to move fuel lines so they get cool air out of harm's way as well.
Vapor Lock: To me was fully warmed up engine then sit at a stop sign or light idling and taking off was like out of fuel till it cooled down vapor to a liquid in lines. Some when you shut them off didn't restart right away. OE Chevs - some did that up to a 1974 I knew of owned by family!
T
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george67
Novice
Sep 16, 2015, 1:18 PM
Post #9 of 11
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Re: looseing prime in gas line
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no gas in oil , checked I keep going back to that fuel pump
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george67
Novice
Sep 16, 2015, 1:21 PM
Post #10 of 11
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Re: looseing prime in gas line
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strange you should say that as a friend of mine said the same thing , move the fuel line
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 16, 2015, 1:28 PM
Post #11 of 11
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Re: looseing prime in gas line
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Yes - move the line with metal line custom bent out of heat of the fan and radiator. Glass fuel filter or see thru same deal you may see it boil. Doesn't take all that much heat.
Said OE's did that all the time in hot weather from a hot engine prior or when driving but got over it when moving along.
Tricks: Move line. One way check valve filters to carb or added? Shouldn't need to.
OK: Happened on '74 and maybe an '83 Chev Suburban 350 specifically, OE fuel line ran from pump up timing cover to carb. Fan blew hot radiator air right at it! Moved it and problem over,
T
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