Fuel Pressure for Lightning

marcusmy2k

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I am having an issue with a 2003 harley if anyone can help. I am at 30psi at idle, amd jumps to around 36 or so when I open the throttle (not under load) when driving, the first 20% of throttle takes off nice, then as I go more open, it gets louder but not a lot of increased speed. This truck is running near 15lbs of boost. I also have another exact 03 that is stock. That truck keeps pulling through the rpm.

The first 03 harley blew the threads out of one of the culylinders, but the plug stayed in. I ended up putting a remain motor in, and still has the weak acceleration. I replaced all coild when I did the motor with msd, and had the injectors cleaned. I also pulled the exhaust and put headers on, no restrictions there.

Original thread that was over 21 years old.
 

FleeMan

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Never occurred to you to drop the tank and check if a fuel hose ripped or if one of the pumps died?
 

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