I have went through 4 fuel pumps in about six months time. I am running a LT1 that has a carb intake with stock TBI throttle body, Howell harness, EBL PCM. This is in a 90 Jeep YJ that orginally had a 4 cyl fuel injected engine. I used the original oem fuel pump to start with. It is suppose to put out 42 PSI but the engine would starve for fuel at WOT. Replaced with another oem replacement Airtex pump and had the same problem. Changed to a Airtex for a 92 Camaro, can't remember the number. It lasted about a week, replaced with another Airtex pump. It lasted about two months and now it has went south. I am running 20 psi with a aeromotive regulator in the return line. Are these pumps that bad or what? I have checked voltage (12 vdc), ground is good, changed fuel filter. I have read on the nets about people using the oem Jeep pump with no problems but mine seems to be the exception. Are Delco pumps any better? Any thing I need to check that could be causing the problem with pumps.