Help guys and gals-I'm on a rented home at the lake and boat has problems. I just completed a swap from the 91 3.0 to an 87 3.0. Motor ran great on muffs for a couple of hours. Put it in lake yesterday for water test and all went well for about 20 minutes. Ran cool, had good power. Went to turn around to head back to ramp and the boat gradually started slowing down. Then it went to popping thru carb and shut down. It will start (won't idle), but now there is a rythmic popping thru the carb, about a pop per second. I did not change last years fuel-I should have. I did install an extra in line fuel filter ( I changed it but it hasn't helped and carb inlet screen is clean)between pump and carb. Compression is good-150 on all 4 cylinders. Carb was rebuilt last year and ran perfect before the problems arose yesterday. When u accelerate the engine, the popping gets faster-faster than the engine revs. I'm going outside now to remove the filter from fuel pump. Sounds like a lean condition to me. Any help or advice is greatly appreciated.
