[Bill Wells]

my car does the same thing with a 1/4 or less tank of fuel. over 1/2 a tank and no problem. fuel sloshes away from my tank fuel line pick up on hard acceleration when tank level is lower, the fuel does not get sucked into the line. i have a fuel pressure gauge , but in the engine bay, so who knows what it reads when i am driving, but with the hood up parked, i know what it is. LOL..so, not much help in real world of driving . looks good though, just not practical for anything but peeking at it when parked. i had a fuel pressure gauge mounted under the dash for a while but got an unpleasant thought about raw gas getting into the cockpit should something fail, like the pressure line or a fitting. KABOOM might be the result, so yanked it out of there . if you think air filter size is an issue, as was stated, pull the aircleaner off and see what happens for comparison. bill.