To any that can help,
I have a 1987 ProV 150 on a 18' Ranger bass boat that has a unique problem. The motor creates a vaccum in the fuel line, sucks the bulb in tight and will bog down and I will get wet. This only happens when I get to a half tank of fuel (the boat has twin 14 gal tanks). If I switch tanks quickly the bulb will come back immediately as well as the rpms. I am then good for 7 or so gallons on that tank. Sometimes I can go back to original tank and run around 3-3500 rpm and be OK, but usually not long after I increase back to around 4500 rpm (my usual crusing speed) the bulb will suck in tight again.
Here is what I have done. I've change the fuel filter, fuel pumps, spark plugs (twice) and fuel line (from ff to tank switch and to each tank). I've taken the sending units out of both tanks to check the screens and they were clean as were the tanks.
I haven't done anything with the carbs yet. Could they be the culprit??
Thanks to anyone who has any ideas.
Rick
I have a 1987 ProV 150 on a 18' Ranger bass boat that has a unique problem. The motor creates a vaccum in the fuel line, sucks the bulb in tight and will bog down and I will get wet. This only happens when I get to a half tank of fuel (the boat has twin 14 gal tanks). If I switch tanks quickly the bulb will come back immediately as well as the rpms. I am then good for 7 or so gallons on that tank. Sometimes I can go back to original tank and run around 3-3500 rpm and be OK, but usually not long after I increase back to around 4500 rpm (my usual crusing speed) the bulb will suck in tight again.
Here is what I have done. I've change the fuel filter, fuel pumps, spark plugs (twice) and fuel line (from ff to tank switch and to each tank). I've taken the sending units out of both tanks to check the screens and they were clean as were the tanks.
I haven't done anything with the carbs yet. Could they be the culprit??
Thanks to anyone who has any ideas.
Rick