Re: Carburetor Question Carter WA-1

Posted by Packard Don On 2018/7/6 11:31:56

Only two things are common for the symptom you describe: fuel starvation or flooding. Other things are possible but seem unlikely. I had thought of a dash pot too but rather than throwing parts at it (especially parts it never needed when new), try to diagnose the problem.

For example, a weak throttle return spring that lets the idle be set at a certain rate but without the linkages fully bottomed out so that it is actually set far lower. When you drive and the system warms up, it closes more tightly and the idle goes below the point where it can run.

You said that all the fuel lines were run away from the manifold and that there is an electric pump at the back by the tank. Did you actually connect a fuel pressure gauge at the carburetor to be sure there isn't too much or two little pressure? Connecting one that you can somehow leave attached temporarily and see while driving might tell you something.

You mentioned, if I recall, using clear fuel lines. Are you sure that the material is actually compatible with petrol?

Are you running the electric pump all the time? Is the stock pump still there and inline? If the latter, try shutting off the electric pump as it really should be used only as a primer to get fuel to the carburetor after it's been parked for some time but the stock pump is excellent for everyday use.

Was the carburetor disassembled and thoroughly checked? Checkballs (if it uses them) and float levels all okay? Needle valves seating properly?