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Can't get gas to come out of the tank. cleaned filter but no gas will come out engine runs with aux. tank.Maybe need new diaphragm under the gas tank? @
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This sounds likely a badly routed fuel line that is getting hot and causing airlocks. The fuel delivery is slow, the gas heats up and vaporizes causing an air lock. You can test by removing the fuel line and with no engine running, run the contents of the fuel tank into a container. Do you have good fuel flow?
Or the float bowl isn't venting via its overflow pipe.
REPLACE FUEL FILTER.+ AIR FILTER.CLEAN FUEL INJECTORS.THEY COULD BE DIRTY .LEAKING WHEN ENGINE IS OFF FOULING OUT SPARK PLUGS.FILL GAS TANK UP.PUT A BOTTLE OF FUEL INJECTOR CLEANER.IN GAS TANK.DRIVE AROUND SO CLEAN CAN CLEAN INJECTORS.IF YOU STILL HAVE SAME PROBLEM.HAVE CAR SCAN TO SEE IF IAT ECT MAF SENSORS IS WORKING.
Check for a fuel filter inline between the gas tank and the carb. Replace that filter ! Also dump half a bottle of Techroline (Chevron) into the gas tank. You are starving the engine of fuel which will lose you power and can cause overheating...check your oil and change often..Techroline can also be found at your local auto parts store....good Luck to you...Tim
check vent line from tank to fuel filter or canister or gas line , get air compresser and blow both lines out towards gas tank having one personstand by tank with gas cap off listening for thump sound or gushing air
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