Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Rebuilt 4988S Not So Good.
Ozzmann:
Cliff, my air horn gasket seems to get soaked with fuel around the accelerator pump, what should I be checking? I've checked float level and needle and seat.
omaha:
hey ozzman, how's it goin "down there" (I noticed you guys got a bit of rain in certain areas- sorry to here about the flooding). As far as the gasket getting wet, it seems like this is THE place that Q-jets like to do this. I do not know for sure how to go about fixing this as I have run into this even after unwarping the body and flatening the top casting. Obviously a thicker gasket would help but I wonder if some fuel is bypassing the accel pump cup. Maybe Cliff will chime in I hope. Seems like this is a common problem.
Hey, goodluck to ya!!
Cliff Ruggles:
If the fuel level is getting high enough that fuel is coming out around the pump, it's a flooding issue.
If the fuel is just seeping out do to being splashed up around the pump shaft, tighten up the clearance between the parts some.
This is very easy to do.
With the airhorn well supported by a wooden block, very gently "peen" the area around the pump shaft until the pump will no longer fit thru the hole.
Then gently drive an old pump thru the hole to size it.
This will minimize any leakage in that area.
If the carb is flooding, pressure and vaccum test the needle seat assembly. I neat was to test them is to put some soap/water mix around the needle and seat assembly. Gently hold down the needle with your finger, and shoot some compressed air into the fuel inlet. If the seat is leaking at the gasket, tiny bubbles will appear.
We get a few in here that are leaking, usually due to damage to the sealing surface, or not getting the old gasket cleaned off. Got one in here yesterday with two gaskets doubled up. The owner of that carb bought all the parts and attempted to do it himself. Did a great job everyplace, except that area.....Cliff
omaha:
Hey Cliff, good info there. I did not know how to do that and would never have thought of it.
von:
Should the compressed air be sealed up to the inlet? If so what PSI should be used?
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version