Offshoreonly.com - Fuel pressure fluctuations Procharger M-1 7.4 MPI

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baronbob

06-02-2005 08:33 AM

Fuel pressure fluctuations Procharger M-1 7.4 MPI

I have set my fuel pressure a number of times under way in order to achieve WOT with out faltering. Initial 4600RPM then backs down to 4200. The last attempt @ this adjustment got me to 4400 WOT but the fuel pressure would fluctuate wildly between 55#s and 46#s. Is this common or should it be more stable?

Turbojack

06-02-2005 09:30 AM

Re: Fuel pressure fluctuations Procharger M-1 7.4 MPI

If set up correctly fuel pressure is related to the amount of boost you are runing. I set mine with engine off at 43PSI, pressure goes down when engine in running & in vacuum, & goes up past 43 as boost goes up. At 10lbs of boost I have 53psi of pressure. Ths way the difference between the two is always the same.

kennyo

06-02-2005 11:07 AM

Re: Fuel pressure fluctuations Procharger M-1 7.4 MPI

Blow your vacuum line out and make sure it's not restrcted. Mine was acting up and it had oil in the line causing it not to activate the regulator.

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