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lowblue320
04-24-2009, 05:40 PM
I need to know what fuel pressure is normal on the 575 Sci on indle and wot?

MERPerformance
04-24-2009, 09:00 PM
Troubleshot this about a month ago. I recall at idle 34# if you remove the vac.line it will be 38#. IF YOU ARE RUNING THE BOAT UNDER LOAD, IT WILL READ 26-28# MY UNDERSTANDING IS THAT I'TS MAPPED FOR A FALLING FUEL PRESSURE. That was my concern at the time seeing the fuel pressure low under load. Mark @ Precision Marine gave me the info. on the falling fuel map.

lowblue320
04-24-2009, 11:50 PM
I heard that 34-35 psi was to much, does anyone else have diffrent numbers

lowblue320
04-27-2009, 09:50 AM
some has to know???

Woody
04-27-2009, 11:37 AM
Merc Service Manual says: Mechanical Pump 3-8 PSI and Electric Pump 34-38PSI. Didn't see anything diff @ WOT.

lowblue320
04-27-2009, 12:31 PM
when I spoke to Bob at mercury racing he said 26-28 Psi ?????? I keep getting numbers all over the place, I would like to know what people are actually at (psi?) on there guages that have 575 Sci.

Wrinkleface
04-27-2009, 01:29 PM
Merc Service Manual says: Mechanical Pump 3-8 PSI and Electric Pump 34-38PSI. Didn't see anything diff @ WOT.

saw this also!

lowblue320
04-27-2009, 02:04 PM
I just go a copy of the H.P. 575 Sci Specification manual and is says in the 3rd page "fuel rail pressure" idle 28 Psi and WOT 26 Psi and on page 6 under the Fuel System Specifications is says Fuel Pressure Regulator setting 30 Psi.