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Author Topic:   FUEL PUMP PROBLEMS
modbob35a
Member
posted July 22, 2002 10:24 PM
Went through 4 pumps in 3 weeks different makes all high pressure. Did have junk in tank cleaned and replaced filter. Last about 2-20 laps and no pressure again. Any suggestions. Have checked push rod,looks good. I am out of ideas. Thanks Bob


Greggie
Member
posted July 22, 2002 11:12 PM
Need more info... What is breaking? Take them apart and see of the valves are breaking off, or what. It almost sounds as if you have a line collapsing and when you move it to change pumps, you get a little more life out of it. What do you run for a bypass device? I might look there also. Also, wash out your fuel filter in a clean blue or black bucket with clear solvent. It would probably scare you to death what you see.

Let us know!

Greggie

autoshop
Member
posted July 23, 2002 11:39 AM
fuel out let at bottom of cell. using c&s mechanical bypass. the last two pumps the levers are broke that work spring in pump. whats wrong with that. bad pumps or something else. thanks guys for the info.


nut3d
Member
posted July 23, 2002 10:30 PM
Sounds like the bypass in the pimp is going bad. what are you running for fuel?????? It also sounds like the springs r breaking in the pump.


Gene
Member
posted July 24, 2002 09:04 AM
We are assuming this is a stock mount sbc pump. Check the rod travel and if it is binding up. Also check the mounting plate aginst another one to see if they are the same. Have you put a new cam in or made some other change?


modbob35a
Member
posted July 24, 2002 09:23 PM
running alcohol 377 sbc all started when changed filter and fuel pump at track not changed cam or anything. Both pumps that i took apart are broke same place. One Coleman and one Edelbrock. Have not looked at other two pumps. Could lobe on cam wear enough causing a slap with the push rod?? Thinking about going to belt drive pump. Thanks again for all of the assistance.


Wheels47
Member
posted July 25, 2002 09:56 PM
You may want to also check the pump clearance where it mounts to the block--if it is breaking the arm or springs. I think on the edelbrock the instructions on a ford engine you sometimes have to grind a very small piece of the pump to keep it from hitting the block so it can bolt on as it should. Not sure about the chevy doing this though. Just a thought. Good Luck--I know it can get frustrating.