My cousin and I - both decent backyard mechanics- are stumped. I say one thing he says another. Here is the issue-- I have gone thru 3 electric fuel pumps in 3 weeks feeding a 1998 Mercruiser 4.3 V6 4bbl. The original pump, a replacement and then another replacement- it is gettingexpensive at $225 apiece. Looks like I need another.
I say we have a short somewhere. He says the fuel is siphoning back ( after 2 days of not running it- on both of the replacement tests) which is being caused by an air leak- leaving the electric pump not primed. It ran great after each new fuel pump was installed- took it out for 3 hrs both times. It ran a little rough but was getting gas into the carb. At that point thought I had a carb rebuild issue.
We just spent 4 hrs in the driveway- willing to do more -But can anyone point us in a direction?
I say we have a short somewhere. He says the fuel is siphoning back ( after 2 days of not running it- on both of the replacement tests) which is being caused by an air leak- leaving the electric pump not primed. It ran great after each new fuel pump was installed- took it out for 3 hrs both times. It ran a little rough but was getting gas into the carb. At that point thought I had a carb rebuild issue.
We just spent 4 hrs in the driveway- willing to do more -But can anyone point us in a direction?
