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Fuel line Flare Fitting size - Regina? 700 1990

posted by  Will740turbo on  Sat Jul 2 15:29 CST 2022
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last visit: Wed Oct 22 16:09 CST 2014
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1990 740GL Regina

Hey folks. I'm trying to "un-hose" this fuel system.

1990 740GL originally had a single in-tank pump. I removed the added-on Bosch pump last night and now it starts and then dies about 30 seconds later, even hotwiring the fuel pump. I have a dry fuel return line after the FPR, so I think that my late friend put a low-pressure pump in the car.

I could re-rig the jerry-rigged Bosch pump setup he had going, but it's got loose wires running under the car from the trunk and just looks bad. I'd like to have the fuel gauge working too, so I want to pull the sender out of the trunk.

The only real hangup is that the plumbing isn't quite right. There is a braided steel flex line going into the fuel filter that needs to connect to this flare fitting from the tank, but I have no idea what size the flare is.

Does anyone know what size the flare fitting is supposed to be? I have it sorta kinda connected right now, but it's still not really right.













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    Fuel line Flare Fitting size - Regina? 700 1990

    uid 27's pic
    posted by  Art Benstein on  Sun Jul 3 08:17 CST 2022
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    last visit: Fri Oct 17 20:10 CST 2014
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    I couldn't make heads nor tails of your text, but a glance at the excellent pictures shows me the same flare joints used in 240 fuel lines since the k-jet era, same as those lines used to circulate ATF through the radiator to cool the automatic transmission. The nuts you want are threaded 1/2-20 for the 5/16 steel line.




    --
    Art Benstein near Baltimore

    "If you can't fix it with a hammer, you have an electrical problem." -vwbusman66








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      Fuel line Flare Fitting size - Regina? 700 1990

      posted by  Will740turbo on  Sun Jul 3 16:22 CST 2022
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      last visit: Wed Oct 22 16:09 CST 2014
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      That's fair enough. This has a backstory to it... I had a friend who bought this car and did some "creative" fixes on it, including putting a high-pressure Bosch pump under the car and discarding the original fittings from this green fuel line to the filter. He died in 2018, and I'm trying to get the under-car fuel filter back to stock.

      Thanks for your prompt and precise answer! I can take the other end of the situation off the car, but not the green tubing. I appreciate you, Art.








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        Fuel line Flare Fitting size - Regina? 700 1990

        uid 27's pic
        posted by  Art Benstein on  Wed Jul 6 12:26 CST 2022
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        last visit: Fri Oct 17 20:10 CST 2014
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        My difficulty in understanding is that nearly 20 years have whizzed by since I last had a Regina 940 to work on occasionally for my late MIL. I remember and documented the lines at the tank, but don't recall anything about what the configuration was at the filter location. I assume the feed of fuel from the filter to the rail was just as it is in a 240 or Bosch-fueled car, with 5/16" OD nylon, but how the feed arrived at the filter input from the steel tube at the tank I have no recollection. Sounds like those are the fittings you're missing.

        I'd suggest the parts drawings available from Volvo dealership websites, but those are confusing enough to us when we have the pieces in front of us much less trying to interpret the artist-conception illustrations.

        Has to be someone still reading this site who has changed a fuel filter on a Bendix-fueled 7/9.
        --
        Art Benstein near Baltimore

        Eat, drink, and be thoughtful.







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