driving\carb problem (please help)
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Joined: Aug 2004
Posts: 796
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FWIW, fuel pressure is also not always a good indicator of flow. Pressure is caused by a restriction to flow. A pump that is "dead headed" can still sometimes build pressure, yet when it is allowed to free flow, will not produce any flow volume. Likewise a pump that will free flow, may bypass and not build any pressure when it is supposed to.
You can test flow by unhooking the fuel line from the carb, turning it up into a jug, and cranking the engine. With no restriction, it should pump a LOT of fuel quickly. Pressure, of course, can be checked with a pressure gauge. Unless you check both, you're only getting half the story. When you check pressure, be sure to check it at both idle and at WOT.
I helped a guy who had a problem with his Corvette. We put a fuel pressure gauge on it and it made 38 PSI at idle where there was little flow. As soon as he pushed the gas though, the regulator was supposed to close and increase the pressure, although the injectors flow more, creating a bigger demand. Instead of going up to 46 PSI, his fell to something like 10.
His was a case of pressure but no volume.
You can test flow by unhooking the fuel line from the carb, turning it up into a jug, and cranking the engine. With no restriction, it should pump a LOT of fuel quickly. Pressure, of course, can be checked with a pressure gauge. Unless you check both, you're only getting half the story. When you check pressure, be sure to check it at both idle and at WOT.
I helped a guy who had a problem with his Corvette. We put a fuel pressure gauge on it and it made 38 PSI at idle where there was little flow. As soon as he pushed the gas though, the regulator was supposed to close and increase the pressure, although the injectors flow more, creating a bigger demand. Instead of going up to 46 PSI, his fell to something like 10.
His was a case of pressure but no volume.
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Senior User
Joined: Dec 2009
Posts: 176
Likes: 1
From: Spring Hill
well i finally fixed my problem, after cleaning my tank and replacein the sending unit i went ahead and put a new fuel pump on it. i unhooked my line goin to the carb and it wasnt pumpin any gas so i suspected i was sucking air somewhere, checked my lines and found out my rubber line goin to my sending unit was loose, i never tightened the clamp. so i tightened that and turned it over and it was pumpin gas. oh yea also when i put the tank back in i only put 5 gallons in it so i thought maybe that just wasnt enough so i added 5 more. drove it down the road and it was once again, a beast, even did a burn out. im pretty happy now
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