CarburetorsCarb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.
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I know it will take the high pressure from the fuel injection pump down to carb pressure.
But will it keep a steady pressure? or does it Fluctuate?
I'm about to put the carb motor in and I'm trying to decide if I should get the Mallory 3-port or use a mechanical pump. My intank pump is brand new. If I use a mechanical FP can I just leave the stock pump in the tank and use it as a pick-up?
I don't know if the pressure fluctuates much if at all. I know I haven't had a problem with it once I managed to get it to stop leaking.
As far as using the stock pump as a pick-up I don't know. Some say yes and some say no, and I've never tried it myself.
__________________ 87 IROC-Z, 350, Stock TPI,Trick Flow 23* heads, LT4 Hot Cam Kit,Coated Hooker 2210,True 3" duals with Moroso Spiral Flows, no AC, T-5, B&M Ripper- converted from auto. 3.73 Posi and PBR rear disk. 324rwhp and 338 rwtq Before tuning with old carb setup. 271rwhp and 357rwtq with TPI. http://www.wku.edu/~nathan.plemons/
Re: Mallory 3 port AFPR w/ fuel injection fuel pump
Quote:
Originally posted by Hodge I know it will take the high pressure from the fuel injection pump down to carb pressure.
But will it keep a steady pressure? or does it Fluctuate?
I'm about to put the carb motor in and I'm trying to decide if I should get the Mallory 3-port or use a mechanical pump. My intank pump is brand new. If I use a mechanical FP can I just leave the stock pump in the tank and use it as a pick-up?
Thanks
Hodge
The Mallory unit will not leak, as this is why it has a return line to the tank....
If you put on a mechanical fuel pump, it will not work by sucking through the electric fuel pump.... you'll have to drop the tank!
But as for steady pressure, these pumps came from the factory with a 50 psi rating.... I don't think she'll fluctuate at all, provided you have no leaks by the CARB.... or pressure leaks by the tank.
Last edited by Street Lethal; 08-07-2003 at 06:20 PM.
I did have a problem with the plugs on the regultor leaking even though I was running a return line. I managed to stop the leaks by using teflon tape made for gas lines.
i have a 750 holley vacuum secondaries on my stock LO5 with open exhaust. and i have a little surging when it starts up, but after it warms up it runs really good. the surging would probable go away if i put a choke on it though.
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1991 Camaro RS. 350(750 holley,L98 manifolds Y and I pipes), 5 speed, with a 3.08 drum rearend.(Many mods to come) Parting out
1977 Trans Am S/E. Pontiac 400 th-350, with a 2.41 posi drum rearend.(Completley stock, and price is increasing daily)
