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By 55Birdman - 15 Years Ago
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I replaced my fuel line,new fuel pump,rebuilt carb,and had gas tank cleaned out. I finished install on Friday and car started ok. I was pleased . Today I was going to take it for a test ride. I started car and backed it out of garage and it stalled . It would not restart. I have an inline see thru fuel filter next to the carb and the fuel was not there . I took lne off carb and motored it over . Nothing. I took pump off and tested it. It does work so I reinstalled and still nothing. I have checked my self several times and all installed item are tight and no leaks. I cant get fuel to carb no matter what I try. I have tried to start car with and without gas cap on . Any suggestions?
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By YellowWing - 15 Years Ago
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Here is a simple way to break fuel problems into sections for easy diagnosis.
Remove inlet hose from pump and put a short piece of hose in it's place. Put the other end of hose in a container of gas. Crank engine, if you now have flow problem is feed line tank or vent. If no flow.
Still using portable fuel source as above disconnect fuel line from carb and put a piece of hose over the end. Direct hose into portable container to collect fuel if test works. Crank engine. Fuel flow now indicates a stuck carb needle or plugged inlet/line. No flow indicates bad pump or possibly a loose pump drive cam inside front cover.
Hope this helps. Mike
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By Ted - 15 Years Ago
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Have you replaced the entire fuel line from the tank to the fuel pump? If so, then verify fuel flow from the fuel connection at the fuel tank. Does the problem show up more predominately when the fuel tank is low versus full?
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By 55Birdman - 15 Years Ago
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I had previously replaced ALL the fuel line. I did not however replace the flex hose at the pump. Until earlier this week . It was collapsing under pressure and causing the flow to stop. Now its all better with new line. Runs fine.
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By GREENBIRD56 - 15 Years Ago
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On mine I found that not only was the hose in less than perfect shape - but the fittings on the suction side of the pump were very tiny. The internal "orfice" at the 90° elbow to the flex line had a diameter of about 5/32 or so. I ended up replacing both the elbow and the flex line with parts that would flow more freely. It is very easy to "throttle" a pump on the suction side - a perfect vacuum would only create flow based on 14.7 psi maximum pressure - and the little pumps don't pull anything like that.
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