Yup. If I was a betting man I'd bet that you have a load of bad fuel/dirty tank/etc. Sounds like you need to open the inspection hatch on the tank, pump out whatever crud that's in there and clean the tank and lines.
Oh, and do yourself a huge favor and buy a fuel/water filter/separator. That should be the absolute last thing your fuel goes thru before it is in the short line to your engine's carb or fuel rail. This way you know that your fuel is clean. Period. (Get one of the ones with the clear plastic bowl on the bottom that you can empty the water out of). Moeller makes a good one, as does Racor, Seasense (Walmart) and several others. Cheapest $60 (about) piece of mind you can buy.
http://www.ebay.com/itm/Moeller-Wate...JXkSxQ&vxp=mtr
http://www.ebay.com/itm/Moeller-Clea...5X0BTL&vxp=mtr
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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.
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