<E28> Fuel Pressure Ratings. 535i M30 engine.. Stumbling cured

["Ron J" <ron@xxxxxxxxxxxxxxx>]

Hi All,

I found a site that does conversions from PSI to BAR. and indeed found out
that a fuel pressure regulator calibrated at 2.5 bar is running at 32 psi
and a fuel pressure regulator calibrated at 3.0 bar is running at 43.5 psi.

So that would definately confirm that the FPR that I installed in my car to
replace the original old faulty one, was in fact the culprit for my
stumbling problems.  Car ran lean due to incorrect PSI/BAR rating, heated
the exhaust up too high, created unneccesary heat within the vicinty of the
feul lines near back seat of drivers side, caused fuel to boil/expand,
causing cavitation in the fuel system, and therefore causing the engine to
stumble.

Now all I have to get done just for safety sake, is change my fuel filter,
and have the resonator in my custom exhaust system moved away from the feul
lines, or have a heat shield put in between them, to ensure that no extra
heat gets to the system and causes me trouble.

Lesson I learned, saving a few bucks on the FPR almost cost me the entire
car, and almost lead me to replace a good fuel pump, in tank and out of
tank, as well as a cold start valve to try and solve the problem..

Cheers
Ron J
85 535i
73 911s 2.7

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