300xs Fuel and air regulators

[DewRonInc]

I found a part number, 8M6002991 air, 8M602889 Fuel. Problem is I have 89 Air and 102 fuel. Pumps are new, no fuel in air side, thats a 13lb split. Anyone have suggestions

[JOE54]

91 is a complete kit for air reg , 89 is just diaphragm fits both fuel and air ,,anyone ever messed with adjustments to regulators without digital pressure transducer ????? both are too low (fuel pres follows air pres) enlist the service of a injector service that has the correct set up to validate the pressures , in think theres one in SC somewhere around GREENVILLE ...

[DewRonInc]

Well, it's kinda strange, I am going to check compressor volume.

[lpugh]

check pressures at 1000 rpm.

[DewRonInc]

i did they don't move

[EuropeanAM]

Check the sleeve on the end of the HP fuel pump.

You can also crimp off the fuel return line (momentarily) with hose pliers. Pressure should spike IMMEDIATELY.

[DewRonInc]

Don I changed pumps and all software and hardware, reason was low pressure. Seems I have a issue regulator

[EuropeanAM]

Ron- I'm sure you did but I'll ask to be safe: You've tested this with at least TWO separate dual-pressure gauges sets with identical results, or with a certified-accurate USB Pressure Transducer?

Just want to be sure since BOTH pressures are off....

[DewRonInc]

Yes sir, and yes sir, they are off

[EuropeanAM]

Give me a call sometime and I'll walk you through some pointers.

[DewRonInc]

Will do don