In addition to the already mentioned items, there could also be a plug in the gas line or tank. The vent line could also be plugged so as fuel is used it creates a vacuum and starves the engine. But again, we need more info to help narrow the possibilities. 
Additionally, did you check the tank for water? if you've got water in the bottom of the tank, and you're sucking water instead of fuel then the engine will not run no matter how good it is.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
Last edited by Destroyer; 07-02-2016 at 07:03 PM.
Reason: added content
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