Join Date: Apr 2007
Location: Keller, Texas, USA
Model: 1988 1500A.
The carb is connected but having problem getting gas thru the petcock. All hoses involving the petcock down to its source is new. But when I crank the bike with my thumb over hose from the vacuum source the amount of pull seems to not be enough to open the petcock to allow gas to the carbs.
Below the sub filter is a manifold with four vacuum lines. One from the autopetcock, one for vacuum source, and two that go up under the carbs. All are tight and not leaking. The autopetcock I installed new diaphragms, springs etc. during the carb rebuild. I do believe it is assembled correctly. Certainly its not leaking any gas.
I am going to examine the vacuum source as its on the intake manifold where it goes into the engine. It might be plugged with something. Or the manifold all these hoses are connected to may have a leak...just a wild guess. This is the reason I finally bypassed the autopetcock in the past. Thinking of running the hose from the petcock directly to the vacuum source bypassing the manifold.
Poured a bit of gas down carbs. Bike fired up and ran with it for what it had. I moved the vacuum hose from the manifold described above directly to the source on the intake manifold still will not open petcock so will tear the petcock down and make sure everything is in place as what I saw in one of the videos I viewed. After that I am dead in the water regarding getting gas thru what is percieved to be connected as it always was. Really hate to bypass the petcock again.