Quote:
Originally Posted by Topsy11
How do I check the accelerator pump. If it's not running and I press the pedal fuel squirts into the carby.
Yes that is correct
So u think not enough fuel pumping I and.its to lean?
Maybe?
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It could be what Officemanager suggested.
"Missing pvc valve could be your backfire problem as it will upset your engine vacuum, this can cause leaner fuel/air mixture ratio making it more volatile resulting in backfiring."
Completely block off your PVC and try running the engine again and see if it reduces the back fire.