In my quest for a permanent fuel pressure gauge setup to go under the hood of my 740 b230f N/A with Regina fuel system, I purchased a gauge from Summit racing, part SUM-800199 which goes up to 100PSI. I had a feeling that the fittings would not work so I only purchased the gauge.

I then went to my local hardware store (a few of them) and was finally able to make a setup with lots of different pressure fittings. (Full story with pictures here.) In any case, the fittings unfortunately leaked. So I went and ordered the fitting from summitracing, hoping that the 3/8" one would fit.

Unfortunately, it does not. The fuel line up near the fuel rail of the car is rubber (or silicone?) with some sort of slightly flexible but fairly stiff plastic inside that the fuel runs through. As such, the 3/8" fitting does not fit in. The line was already cut so I was able to get a measurement of the fuel line's inside diameter now finally. It is 1/4" inside diameter, so the barb needs to be only slightly larger than that.

After calling up summitracing, I was informed that they don't carry the part. However, they referred me to NOS, who did have the part. The part #'s required are 16776 (the Tee fitting) and 16244A (you need 2 of these, they are the barbed ends. The catalog for that is here.

This little project has come out costing quite a bit more than I wanted it to cost, but mostly due to getting the wrong parts. In any case, the parts for the new tee fitting and the barbed ends cost a total of $27 and will arrive in a week or two. Hopefully these will work properly.

The gauge cost about $24. The original leaky brass fittings cost a total of about $20. The one piece 3/8" that did not fit cost another $13, but luckily I'll be able to get a refund on that, so the return shipping cost is only about $3-4.

In all, money that went down the drain (not including gas money for all this driving around ;)) was $24+$20+$27+3 = $74 for a permanent gauge.

But if I had gotten the right parts in the first place, it should have only cost around $50.

I'll update everyone on this when my new parts arrive. As for now, my fuel line is cut, so I'm going to need a lift to the local plumbing store for a one piece hose splicer thing and just clamp it down. :)
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Kenric Tam
1990 Volvo 740 base sedan (B230F)
My Volvo 'Project'