Gold Lifetime Member
Join Date: Apr 1999
Location: Vancouver Island, Canada
Re: Carburetor Fuel Leak
1)First thing i would do is pull the needle and seat oyt and inspect the O rings on them.Look for any signs of wear or cracking.
2) Set the float levels to bottom of sight glass. Fuel should not be seeping out.
Note: make sure you have some replacement gaskets for the adjustment nut and screw as these will most likley tear when you adjust the floats. The nylon washer set is a better way to go as they are reusable. Nothing worse than being held up because of a paper thin gasket.
3) Make sure your timing is correct so you are not causing a lean condition. (fuel boiling)
4) Keep an eye on your Vacume secondary pump housing and shaft. Is there any fuel dripping from it? You may want to check the diaphram for damage. If carb has been sitting for a while these parts dry up and become brittle.
5) Check your fuel pressure! These carbs can only take 7psi before you start running into issues. Have you replaced your fuel pump of late and if so with what?
6) also look at the base gasket when things are running. Is there any fuel leaking out or do you hear any hissing sounds that would point to a vacume leak or a blown gasket on the base plate to carb body which they are prone too.
7) what is your vacume reading at idle with hose from distributor plugged? What is the power valve that is in the carb at present? Have you changed it or someone else?
8) have you recently had any head work done? Are the valves set properly? A sticky valve or incorrectly set valve train will allow back pressure to the carb.
67 RSSS Van Nuys, 4th week Sept,1966
ps,tilt,headrest,spd warn,pw,am/fm,delux int,
remote mirror,rear defrost,tint glass.etc...
TKO 600 Extreme,12bolt 3:73 gears.
Last edited by 67RSSS; Jul 10th, 12 at 11:42 PM.