Fuel pump question

[monte07]

I have an '86 260 Mercruiser Alpha 1. I changed the fuel pump on it because it was making an awful racket like bad lifter noise. After the install she fired right up and idled fine for 5 minutes and then started stumbling a good bit. I checked the choke, it was open, but I saw gas just being dumped down the primaries. Had the carb rebuilt at a reputable carb shop. Put on the fresh carb and had the same exact symtoms. The fuel is from late November with stabilizer added and smells OK. I put on a new 10 micron water seperator with the rebuilt carb. My question is it possible for the new pump to be putting out too much pressure? Its a new Quicksilver pump. And is it possible to get a pressure reading from the pump by just turning the motor over?

Thanks, Rich.

 

[mkast]

Re: Fuel pump question

Yes.

 

[monte07]

Re: Fuel pump question

An Update.
I ran a temporary fuel line from the pump to the carb and "teed" in a pressure gauge. Ran the motor and the gauge was pinned at 10psi. Exchanged the pump for another one and had the carb checked out. Put eveything back together and motor is idling fine, no issues. Psi with the new pump is between 6 and 7.

Thanks, Rich.