REPLACING LIFT PUMP

[P27]

I have a universal M2-12 engine that has been making oil I suspect it is the lift pump. I want to change the lift pump for a 12 volt Automotive type of pump my Napa dealer has a pump that puts out 7-10 psi @ 32gph my pump puts out 6-8 psi at 32 gph would ther be any problems with using the higher pressure pump

[scoobert]

i suggest the lift pump i used on my duramax.
ask for the frame mounted lift pump for a
1995 chevy suburban 2500 6.5 liter turbo diesel
its $70 and they run typically over 10,000 hours.
the M2 is a tiny engine right? if so you will never need 32GPH.

[gjordan]

I have run 3 diesels with NAPA 12 volt fuel pumps, after lift pump failure. They all worked fine and made bleeding a lot easier. ____Grant.

[P27]

Thanks scoobert and gjordan I wanted to find out if the higher pressure would have been a problem or not the other pump that my napa parts store could get was lower pressure 4 to 7 psi which would have been in the middle of the range of my original pump for the highest pressure. I would assume the higher pressure pump may not work as hard as the smaller of the two pumps.

[sartorst]

If you want a GOOD fuel pump get a Walbro marine pump

[gjordan]

I now run my Perkins Turbo 236 in my backhoe without any fuel pump. I discovered that the fuel tank ,being a foot+ above the injection pump was enough pressure to make the engine run fine. If you find yourself with a bad lift pump, a small tank (from your outboard??) a foot or more above your injection pump will probably get you home. Just something to keep in the back of your mind. _____Grant.

[Jim Cate]

Originally Posted by gjordan

I now run my Perkins Turbo 236 in my backhoe without any fuel pump. I discovered that the fuel tank ,being a foot+ above the injection pump was enough pressure to make the engine run fine. If you find yourself with a bad lift pump, a small tank (from your outboard??) a foot or more above your injection pump will probably get you home. Just something to keep in the back of your mind. _____Grant.

Exellent point, Grant! Something to consider when outfitting a boat for offshore cruising... get the necessary fittings for making such a setup work on your own boat and hide them away for a "rainy day".

One must include some means of getting the fuel from the storage tank to the new day tank, which is not always possible utilizing gravity alone!

Cheers,

Jim

[Celestialsailor]

Originally Posted by sartorst

If you want a GOOD fuel pump get a Walbro marine pump

I second that. I always use the old rotary type Walbro (not made anymore) inline with the lift pump. Flip a switch and voila...primed.