Quote:
Originally Posted by Cory M
The wiring has been checked many times by many experienced people so I'm pretty sure it isn't a loose ground although it seems like something electrical. It's running an MSD box, don't recall which one, but it is commonly used on 911's.
The tank was drained and we've replaced the pump and filter. We did find debris in one of the carb jet but it was cleaned up and the problem persists. There is a fuel pressure gage mounted in the engine compartment so we can verify the pump is working while testing it on the dyno.
I just got an idea, I'll have to find out if the relay and fuse for the fuel pump have been checked or replaced. If the fuse is bad the pump wouldn't work, maybe a faulty relay? Still not sure why it would only stumble at high rpms but it's one more thing to check..
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If the fuel pump relay or fuse were bad it would not run at any RPM so we can cross that off the list.