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1999 Sunsetter fuel tank issue??


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Fuel pump is working but nothing getting to the carb, the lines appear to be in good condition as well, is there a filter in the tank that could be preventing gas from flowing? Just need some advice before moving to the fuel tank. thanks in advance.

Edited by leugie
spelling error
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its definitely a carb, and it was replaced last summer, ran great early this summer, now no fuel.

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No in tank fuel filter in the 99, some of the tanks have an Anti siphon valve on top that can get clogged, it should be directly above the tank where the fuel lines attach

Edited by Bozboat
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Fuel lines can appear to be in great condition outside and be a train wreck inside.  Chunks of rubber can come off and clog the line. 

If your fuel line is original, it may be best to just change it.  This goes for the exhaust hoses as well.  I suspect that a carb should only have one fuel line instead of two since it doesn't need a return line, but that could depend on the pump setup.

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@leugie - What is the fuel pump configuration?  Electric or mechanical, in tank or external?  What test indicated the fuel pump is working?  There should / could be an inlet screen in the tank suction line, you will have to pull the tank unit to clear it, although @Bozboat indicates there is none and owns a boat of that vintage.  As noted, if older rubber lines they may have deteriorated as old lines not compatible with ehtanol fuels.  Not sure what carb you have, some have an inlet filter in the fuel line to float bowl attachment.  From your description, I would work backwards from the carb inlet back to pump outlet by pulling the hose at each junction and either do a flow test (output in to a container) or pressure test (gauge) to pinpoint where flow restriction exists.  If nothing at pump outlet, you might need to do a pump test with a known good supply.  If pump is good, a simple attempt to fix supply issue may be to blow compressed air back in to the tank to clear any debris, do this carefully.  If that solves the problem, determine what it is and correct so problem does not simply reoccur.  Also, you might check to make sure the needle & seat at the carb is free and not blocking fuel entering the carb.  That could simply be a light hammer tap:-)

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6 hours ago, Woodski said:

@leugie - What is the fuel pump configuration?  Electric or mechanical, in tank or external?  What test indicated the fuel pump is working?  There should / could be an inlet screen in the tank suction line, you will have to pull the tank unit to clear it, although @Bozboat indicates there is none and owns a boat of that vintage.  As noted, if older rubber lines they may have deteriorated as old lines not compatible with ehtanol fuels.  Not sure what carb you have, some have an inlet filter in the fuel line to float bowl attachment.  From your description, I would work backwards from the carb inlet back to pump outlet by pulling the hose at each junction and either do a flow test (output in to a container) or pressure test (gauge) to pinpoint where flow restriction exists.  If nothing at pump outlet, you might need to do a pump test with a known good supply.  If pump is good, a simple attempt to fix supply issue may be to blow compressed air back in to the tank to clear any debris, do this carefully.  If that solves the problem, determine what it is and correct so problem does not simply reoccur.  Also, you might check to make sure the needle & seat at the carb is free and not blocking fuel entering the carb.  That could simply be a light hammer tap:-)

There is a hose with a screen on the bottom of the fuel line in the tank.  That screen could be clogged.  The gas tank has a well ( 3-4" wide and 3-4" deep running fore and aft along the bottom of the tank) and that hose with the screen needs to set in the well and not to the side of it to allow you some fuel in a hard turn when running with low fuel levels. @formulaben mentioned the fuel lines, if they are original or even ten years old, they need replacing.  

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Great information guys, Im going to replace the fuel line and inspect the tank for all the issues mentioned, thanks again, i will keep you posted.

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