Isuzu Repair: 1988 trooper, fuel leak, gas cap

Question
1988 4cylinder trooper,fuel leak at injectors,replaced o-rings twice,remove the gas cap and the leak slows.how do i set the fuel pressure.110,000 miles.

Answer
Well there should be a nozzle on your injector rail. The only thing I can think of is take it to a small shop and have them do it. Not expensive at all like 35.00 dollars. and they even clean it too! Have you used a good nitrile seal o-ring from NAPA?? They are such a good o-ring.