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Author Topic:   fuel pump
GRTWallbanger
Dirt Maniac

Total posts: 196
posted April 07, 2005 03:53 PM  
When setting the idle on our car the fuel pressure was bouncing from 3 to 7psi.
Is this a fuel pump problem?The pump i have was brand new last july.Is there anything to do to save the life of a alky fuel pump and can i take it apart and maybe clean it?

HarrisMod#30
Dirt Freak

Total posts: 353
posted April 07, 2005 04:03 PM  
we had that problem, it was our regulator, it was so bad we couldnt time the car, installed a new regulator and everything was good to go.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted April 07, 2005 05:34 PM  
If you didnt clean up the pump and regulator at the end of the season it may be somewhat plugged with residue from the alky.

In my opinion the best thing you can do fuel wise on an alky car is get a belt drive pump. Then you dont have to worry about fuel supply problems,or have any diaphragms to get eaten up and start leaking or whether or not your pump is about to go out or not.

[This message has been edited by dirtbuster (edited April 07, 2005).]

drt07
Dirt Newbie

Total posts: 2
posted April 10, 2005 09:34 PM  
If it is a mechanical pump, the pressure will flucuate dramatically at idle, due to the pumping action of the pump running off the cam lobe, if its a belt pump, check regulator as said before, also try cracking the line at guage, ive had air get trapped in the guage & cause strange readings.

Dman
Dirt Freak

Total posts: 270
posted April 11, 2005 07:29 AM  
Another possible remedy is to put the fuel pressure regulator back at the fuel cell on the return line.The length of line from the carb to the cell will absorb some of the pulsation from the mechanical pump and stop the fluctuation and the flooding that comes with it. This was told to me by Howard Stewart at racepumps.com last week.
We are going to try one of his piston pumps this year. Trick looking piece. Check it out!
Performance Bodies sells the pump for $279.99. Cheaper than a belt drive and lighter.No belts or pulley mandrels to deal with and will deliver enough fuel to handle 1200 hp!
You should also run some kind of alky lube.This will save your fuel system no matter what kind of pump system you run.
Striving for sanity in racing. Dman

[This message has been edited by Dman (edited April 11, 2005).]

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