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Measuring 940 Fuel pressure when your rail has no Schrader tap... 900

posted by  9Shenandoah on  Wed Mar 2 07:30 CST 2005
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last visit: Mon Apr 16 10:09 CST 2007
[RELATED]

(1991 940 Volvo 940 Turbo 230BFT Garret 24 A/R 48 ; engine floods out at times)
I have a BAD need to know my Volvo 940 Fuel Pressure, and my Volvo 940 's fuel rail does not have that Schrader fitting. I know Mr. Ringlee discusses a method to make a fuel pressure guage within the Volvo Fuel system, but I don't have all those parts.
The hardest part to workaround is that the Main Fuel Line Hose has a Female threaded fitting on its end that mates to a male fitting on the engine fuel rail that is some kind of metric thread that I can not match with any conventional adapter.

Doesnt anyone sell this whole setup relatively inexpensively?

Measuring 940 Fuel pressure when your rail has no Schrader tap...








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    Measuring 940 Fuel pressure when your rail has no Schrader tap... 900

    posted by  c_j_mooney on  Wed Mar 2 07:49 CST 2005
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    last visit: Wed Sep 14 17:39 CST 2011
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    Yes, very inexpensively - your local scrapyard or indie Volvo shop. On a scrapped car, where the main fuel line connects to the rail, just cut the flexible main line & hacksaw the rigid steel line that's part of the fuel rail... This becomes your fittings for the male & female connectors on your car. Just attach your gauge to these lines with a tee fitting between them.
    -Chris








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      Measuring 940 Fuel pressure when your rail has no Schrader tap... 900

      posted by  Steve on  Wed Mar 2 10:41 CST 2005
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      last visit: Fri Oct 24 07:16 CST 2014
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      This is sometimes tough when the yard can get $$$ for the fuel rail and injector assembly. Pick and Pull might allow it.

      But: while I bought the Volvo fitting since I had some of the parts already, you need not do this. The Volvo threads are 14mm by 1.5mm pitch, almost the same as a 3/8 NPT brass fitting with 18 threads per inch. A little teflon tape will take up the gap.

      Get one male 3/8 fitting with a hose barb and one female 3/8 fitting with a hose barb. Using hose, insert a "T" fitting in the middle and insert this into your disconnected fuel line at the fitting. Get a 1/8 female fitting with a barb and insert this into the test hose that hooks into the T. Then buy a Schraeder male fitting and insert this in the 1/8 female. Depending on the stock at your local Home Depot or plumbing supply, you may need some adapters to complete this. Attach the fuel tester to the schraeder valve.








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        Measuring 940 Fuel pressure when your rail has no Schrader tap... 900

        posted by  spook on  Wed Mar 2 11:20 CST 2005
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        last visit: Fri Oct 24 08:06 CST 2014
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        Dear Steve,

        Good p.m. Genius!!!!! You should submit your fuel pressure measurement port insertion method, to Steve Ringlee, for inclusion in the next edition of the FAQs.

        Yours faithfully,

        spook







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