Intermitant fuel pressure

Snakebit · #1 (**permalink**) 05-16-2009, 08:16 AM

I have a Weber set up using a Carter M6904 mechanical fuel pump. On the way home the car starts to cut out. I pull over and it starts, but as soon as I start to pull away it sputters and dies. I start it again and look at the fuel pressure guage and it's reading 0! I was able to nurse it home. The fuel pump has less than 300 miles on it. I pulled it off and worked the lever I had pressure comming out, but very little suction going in. Took it apart and the diaphrams look good, no holes. I could not check the 3 valves that are pressed in the housing. New pump on order.

Ron61 · #2 (**permalink**) 05-16-2009, 08:38 AM

It sounds as if you have found the problem but I would be sure the line from the tank isn't plugged also. And do you take your pressure before or after the fuel filter? I am sure that you have already checked this but it is just a thought.

Ron

Snakebit · #3 (**permalink**) 05-16-2009, 09:38 AM

I have a Fram HPG1 in line filter. That's the first thing I checked. Pressure is at the fuel pressure regulator just before the carbs. I just have a problem with a carter pump failing after 300 miles.

Doug I · #4 (**permalink**) 05-16-2009, 11:59 PM

this sounds familiar .......

A 350 chebbie ....

RICK LAKE · #5 (**permalink**) 05-17-2009, 05:42 AM

Snakebit, If the tank is empty or almost, you might want to check the pickup in the tank and the rubber hoses there too. It is possible that you could have a small leak in the system. A fuel pump should not go dead in only 300 miles. If there is a restriction in the pickup tube, yes would be the answer. You could also hook up a vacuum gauge to the inlet on a tee and see what vacuum pressure the pump is pulling. Rick L.