msd fuel pump

plasticcat · Post by **plasticcat** » Sat Dec 03, 2005 9:04 am

does anyone else have this fuel pump

http://www.msdignition.com/fuel_7.htm

i got it and i mounted it about 3 feet away from the gas tank, it is below the gas tank mounted on the frame . and i can drive roughly for about 10-15 min, but then my engine just dies and i have no fuel pressure, so i had to sit on the side of the road for about 15 - 20 min then i tryed to restart it and fired right up... ??? like the fuel pump just stoped working

anyone else have this problem

woh · Post by **woh** » Sat Dec 03, 2005 10:12 am

Plasticcat

I'm wondering if there is a way for air to enter the fuel tank. If you build up a vacuum in the fuel tank you might get this symptom.

Another thought is the fuel filter. Is it clean?

werner

ChevelleFan · Post by **ChevelleFan** » Sat Dec 03, 2005 11:11 am

I've been running that same fuel pump on my Chevelle since March and haven't had any problems.

-Dave

Niels · Post by **Niels** » Sat Dec 03, 2005 11:19 am

Had 2 things :

Heating up the tank because on my bike the tank is small.
And not enough feed, too small feed line so had to suck very hard and not flowing, so started boiling inside the pump.

73Inka2002 · Post by **73Inka2002** » Sat Dec 03, 2005 4:00 pm

I certainly don't want to hijack your thread, but I'm curious to know if this pump is relatively quite when operating.

Thanks,
Robert

ChevelleFan · Post by **ChevelleFan** » Sat Dec 03, 2005 4:08 pm

I was wouldn't call it quiet, but I wouldn't call it horribly loud, either. But I can definately hear it at idle. I only mounted it with the supplied brackets. I'm sure it could be quieted a bit more with more isolation in mounting it.

-Dave

510rob · Post by **510rob** » Sat Dec 03, 2005 4:54 pm

A friend bought an MSD pump. It came with a pair of brackets, and the pump itself stuffed into a foamy rubber sleeve. When I peeled the sleeve back, I found a Walbro part number on it (I seem to remember it was a Walbro GSL392)

DonBecker · Post by **DonBecker** » Sat Dec 03, 2005 10:05 pm

I bought a holley pump and it was actually a walbro as well.

As for the original post,

plasticat, is there anything different occurring in that 15-20 minute period?

My car had a rubber supply line pinched, and idle and crusing would work fine, but a couple minutes on the highway and it would just die.

Took me forever to figure out.

I ended up doing a flow rate test.

You grab a container to safely store fuel in, unplug the supply line from your fuel rail, then hot wire the pump and time it. Measure the amount in the can, and figure out how much you are flowing.

How big are your fuel lines (both of them). I heard a theory once (don't know if it's true) that a too small return can cause a backup of pressure in the fuel system lines.

What is your fuel pressure at idle? Can you run a gauge from the rail to your windshield and observe pressure during the stall?

What is the status on your fuel pressure regulator?

Just some open ended questions to help...

plasticcat · Post by **plasticcat** » Sun Dec 04, 2005 3:14 pm

i think the vacum of the tank was it, i put a breather 1 way valve in and a new filter and so far nothing has happened, befor i put the breather in i noticed when i un did my gas cap there was a relife of vacum

uberbug · Post by **uberbug** » Sun Dec 04, 2005 8:58 pm

Glad to hear your problem is solved. I was going to say it sounds like a tank vent issue for sure. Same thing happened to me on a boat heading out to the middle of SF bay...

I have that same pump and it seems to work fine. Only problem is it is REALLY loud. I don't have the original mounts but have it protected with rubber hose between anywhere it touches metal and its seriously loud. Passengers in my car always wonder what that funny noise is. Only benefit is I can "hear" when I am running out of fuel: the pump spins faster.