Agreed, OEM parts only. I'd look at pretty much every part of your fuel system. Somewhere you have an air leak that's allowing the system to fill with air over time, causing you to lose prime. Check all your hose connections, wherever there's a hose barb. If the hose spins on the barb easy that's a potential leak point. How old are the quick connectors on the hose ends that connect your hose to the portable tank and to the engine? If the little "o" ring seal on the one from the tank is cracked that will allow air into the system also.
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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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