My valk has been having some idle issues when it gets warm but today it died. I figured the idle trouble was a vac leak but after changing the hoses, especially the one to the petcock it still won't crank. Appears to have spark so it prob gas. I changed the in-line fuel filter and flushed the old gas which was pretty dirty. Any ideas? It died like it was running out of gas. The idle problem had a similar feature.
There are three vitals when it comes to fuel supply. Vacuum to open the petcock. Sounds like you may have cleared this as a possibility.
Air supply to the tank. If vacuum is not an issue, there may be a problem with the air supply to the tank. The little steel tube that comes off the tank connects to a vent hose. If the vent hose is pinched or collapsed you will experience the exact symptoms you have described. It's very easy to check. Simply open the gas cap and try running her that way.
Third is fuel delivery. Stock Valk petcocks are gravity fed once the vacuum opens the petcock valve. If air flow to the tank is not the issue, try pulling the fuel line off the petcock and sucking on the vacuum line that opens the petcock valve. Fuel should flow freely.
Let us know if this helps. Feel free to give a call. I live in mountain time zone. 208-965-4168.
Greg.