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1991 745 turbo fuel supply questions 700

posted by  awilson on  Fri Sep 24 08:33 CST 2010
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last visit: Wed Mar 5 15:30 CST 2014
[RELATED]

Gas mileage has been lousy, so I pulled off the FPR vacuum hose and smelled fuel.
I looked for a schrader valve on the rail, but couldn't find one. There is a fitting of some sort pointing down from underneath the rail just in front of the #4 injector. It has a rubber hose connected that disappears below the intake manifold. So the fuel supply comes in at the front to the FPR, the return goes back off the opposite end of the rail.
1) What is that 3rd connection on the bottom of the rail near the 4th injector?
2) Did some of the 700 models not have a schrader valve by design, or would this perhaps indicate a replacement rail?
3) Does the smell of gasoline, alone, indicate FPR failure?
4) If I test the FPR, instead of the fuel rail pressure, what vacuum level should it hold and for how long?
5) What should the running engine intake manifold vacuum level measure?

Thanks for any input, Al

--
Optimist - half full, Pessimist - half empty, Engineer - The capacity is twice what it needs to be.






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