Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
running out of fuel
Cliff Ruggles:
You aren't making enough power or running quick enough to be having fuel delivery issues with a .135" fuel inlet seat in that carb. Not sure what's going on, but for sure I would check everything before the fuel pump to see if there is a restriction someplace.
Some fuel tanks uncover the pick-up quite easily at the track as most are front located and the back part of the tank has a long slope to it.
The T-II intake isn't helping things much, unless you have a lot of gear/converter the carb woln't leave hard and take while to get into the good power. The T-II is also set up with a square flange and requires an adapter from what I can remember, another potential "choke" point in the system.......Cliff
dlong70elcamino:
Cliff I got the running out of fuel problem fixed with the new pump I even had the fuel tank down to 1/4 tank or less and it was ok. I just think the engine should make better power at higher rpm I am wonder if its too fat on the secondary side I am going to take some secondary metering rods to the track next time and lean it back some to see what it does. I got some AY,CP,DP, and its got CEs in it now.
Cliff Ruggles:
I agree, with 292 duration on a 114LSA it should pull really hard past 5000rpm's, that's a LOT of cam for 350cid at 10 to 1 compression. I only run 289/308, 236/245@ .050" cam in my 455 at 11 to 1 compression and it makes great top end power and still pulling really hard at 6000rpms.....Cliff
dlong70elcamino:
Update:well Cliff I had it to the strip this week end and it ran great. Man I was about to give up on this Q-jet. Here is what i did took out the carb filter replaced with a in line filter and took out the choke plate and added 4 degrees to the base timing now the base is at 14 degrees didn't check it at all in advance but the engine loved it. Got the car weighed its at 3760 with me and 1/4 tank of fuel. It ran a best time of 13.66@ 97.98 mph 60 ft was 1.9 on all 6 passes and mph was 97 on all 6 too boy i was pumped 14.30 was the best it was running I,m shifting @5500rpm ran it clear down to 1/8 tank of fuel no problems. Thanks for your help. Dan........ :)
Cliff Ruggles:
Good news! Nice runs, but I think there is more in it, should be running over 100 mph for that ET, keep tuning......Cliff
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