Current issue: The car has been struggling to accelerate, it backfires occasionally, sputtering etc... I can barely get going from a dead stop. 0-40% throttle works OK, but anything more and the car feels like it's going to die. It will rev to 6k no problem, but as soon as I push the gas pedal (at any rpm) it feels like I let off the gas.
Background: The fuel pump went out about 1500 miles ago. I replaced it with a URO unit, which has been a bit noisy but worked fine. At the time, I didn't replace the o-ring between the fuel pump and gas tank. When topping off the car, gas would leak out this area. A few days ago I installed a new o-ring, which eliminated the leaking gas issue. However, after driving the car for 20 mins this new sputtering issue began. I figured there could be some crud in the fuel filter that was knocked loose, so I replaced the filter yesterday, but that didn't help. Any ideas??
The car: Only modification to the engine/fuel system is a Miller MAF. Otherwise it's just a stock M20.
TLDR: Replaced fuel pump and fuel filter, but the car is still sputtering and struggling to accelerate.
Background: The fuel pump went out about 1500 miles ago. I replaced it with a URO unit, which has been a bit noisy but worked fine. At the time, I didn't replace the o-ring between the fuel pump and gas tank. When topping off the car, gas would leak out this area. A few days ago I installed a new o-ring, which eliminated the leaking gas issue. However, after driving the car for 20 mins this new sputtering issue began. I figured there could be some crud in the fuel filter that was knocked loose, so I replaced the filter yesterday, but that didn't help. Any ideas??
The car: Only modification to the engine/fuel system is a Miller MAF. Otherwise it's just a stock M20.
TLDR: Replaced fuel pump and fuel filter, but the car is still sputtering and struggling to accelerate.
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