I had two lift pumps and still had 3 psi fuel pressure, granted there was no spring in the OFV at the time.
Either way, these engines like a higher fuel pressure then your normal electric fuel pump puts out, I would recomend atleast checking the OFV and possible getting a fuel pressure gauge. http://www.cumminsforum.com/forum/94-98-engine/137589-how-check-fuel-pressure-12-valve.html
There are a lot of people that inaccurately call different mods 'investments', a fuel pressure gauge is an investment.
Either way, these engines like a higher fuel pressure then your normal electric fuel pump puts out, I would recomend atleast checking the OFV and possible getting a fuel pressure gauge. http://www.cumminsforum.com/forum/94-98-engine/137589-how-check-fuel-pressure-12-valve.html
There are a lot of people that inaccurately call different mods 'investments', a fuel pressure gauge is an investment.