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Rough idle had gum in fuel tank from truck sitting a while,took it off and cleaned throuly,took fuel pump ,carb off cleaned also,got it to run great ,a week later started it up run bad ,back bowel is still dripping aftre you shut it off. any ideas. 77 chevy truck

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Sound like your float is not closing the needle and seat.You might need a rebuild as the fuel when sitting ruins the rubber in the seals.

Posted on Nov 29, 2008

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Why does it Start and idle great but when i aply gas injectors close


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Long story short after running fuel below E and fueling at station idle went rough then motor quit will start w flud and run a few minutes even afterchangng filter as well as draining tank


Its possible you gummed up the pump, or cooked it.
There may be goop in the strainer before the pump from the bottom of the tank, and the pump may also have overheated since the gas in the tank acts as both a coolant and a lube.

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I have a 1987 caprice clasic with a 305 v8 2 barrel that I have to pump the gas pettle to keep it running. could this be the carb or the fuel pump?


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Car starts fine idles rough dies soon as u give it gas replaced fuel filter crankshaft positioning sensor wires running from coil to sensor are not touching and are not broken replaced plug wires and plugs...


If it sat for 3 years the fuel may be in pretty tough shape. If he gasoline smells like a can of old varnish or turpentine then it may have gummed up either the fuel pump, injectors or both. I would start by testing the fuel pressure with a gauge first to see if it is actually pumping enough fuel to run the engine. If the fuel smells bad or your pump isn't working you may need to have the fuel tank removed and cleaned and the fuel lines flushed to get all the old gunky fuel out of them. Also check to be sure you actually have spark at the plugs so you'll know if the ignition system is still working.

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1 Answer

I have a 1987 mighty max truck that has been sitting for years. The motor turns over but wont start unless I pour fuel into carb. Where do I start to make this truck run again?


I expect the carb has become heavily fouled, old gas will quickly gum things up. I'd drain the tank, add new fuel and rebuild the carb. Also insure you have fuel to the carb (possible failed fuel pump)

If I may help further, please let me know,
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Idles rough, then turns off


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