Fuel pressure problems.
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Launching!
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Joined: Feb 2005
Posts: 248
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From: Chesapeake, Virginia
Fuel pressure problems. I have a 98 SS camaro, heads, cam and a procharger putting out 15 psi. The fuel system is a Walbro 255 in the tank with a MSD voltage booster and 60lb injectors, stock fuel lines. On the dyno trying to tune this under full boost the fuel pressure is dropping from 60psi to 40psi at about 4600 rpm and leaning out of a safe A/F. the car should be making around 600 rwhp. Is what I have enough? and if not what is needed? Any and all help is greatly appreciated as i would like to get this car to the track before it closes for the season.
Is it a steady drop or a rapid drop as soon as you hit 4600 rpm? Don't quote because I'm no expert, but if it's steady it might be your running out of fuel pump. Now if it a dramatic drop at 4600 rpm then it might be that your alternator is going bad which shuts off any power going to your pump right at 4600 rpms. I'm recently started experiencing this, but mine was dropping to 40 psi at 6000 rpms. I'm going to change out my autozone special alternator with a oem Ac Delco one... One other thing I started hearing noises here and there coming out of my alternator like a whine of bearings when all this started happening hope this helps...
