What can cause my 1998 Chevy Blazer to have low fuel pressure? I have put a new oil pressure switch and a fuel pressure regulater. and still having the same problem. and is very hard to start.

 

A weak fuel pump can cause this. Do you frequently run your tank low before filling up? Gas in the tank is what keeps it cool. If you have a low tank a lot, then premature pump failure can be expected because the pump runs hot too long. Also, when's the last time you changed the plugs, cap, rotor and wires. Old wires can cause starting problems, but that usually occurs in the cooler weather, not summer heat.

 

No i never let my tank run low. And always fill up at the same gas station. i have to let pressure build up or it will stall out. but once it builds up it runs fine. What would be the cause of loosing pressure. did a pressure test and it said i was at 10 and when started it went to 30 psi.