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Triumph TR6 - Fuel Pump Keeps Leaking?

A week ago my TR6 died on the side of the road. Long story short, traced the problem to "bad" fuel pump. Got a Moss replacement and spent about an hour trying to get the old fuel connector lines not to weep gasoline from pump connections. I finally got it "good enough" to limp home where at least I could work on it properly. I figured for whatever reason (old, worn out, too many connections), the lines / compression sleeves must need replacing. Ordered, bent and installed the new lines (inlet, outlet) with new compression sleeves. Went for a test drive and all seemed fine until about an hour after parking when I kept getting "that" fuel smell coming from my garage; sure enough, the pump was wet with fuel near the inlet and outlet areas. Tried "snugging up" the connector nuts, but it still seems to be weeping just enough to emit an odor. Please don't tell me I was supposed to flare the fuel line ends before installing them because Moss never mentioned that when I explained the original problem ( new line order). This is getting ridiculous; does anyone have any ideas before I light a match?
Thanks, Matthew
M Moment

First thing you should consider checking the screws around the body of the fitting to make sure they are tight and leak isn't coming from the diaphram faying surface. There should also be one screw or bolt on the pump dome, check it as well. I've seen those loose out of the box. Next is contacting Moss on this if that doesn't address your issue.

I can't say for sure on these fittings since mine are long gone and I haven't fiddled with them in a while but can tell you this much. First thing is that the tube is not flared in its standard configuration, at least I remember that much.

There is a difference in thread count between British tapered pipe threads and US tapered pipe threads. I know that these are not tapered pipe threads but given that, there may be some difference on the flare angle of the compression sleeves. Here I think there is no thread count mismatch for the nut that helps to seat the ferrule. In general there are two standard flare angles. For the standard single and double flare style, most automotive applications use a 45 degree seating angle, the other is a 37 degree seating angle from the old AN standards and continued in use to this day in other applications. It may not seem like much, but one of these and one of those will never seal, it must be a matched set to seat and seal.

The question for Moss on this would be "is there something different about this ferrule (other than price and the fact that it comes from Moss or Roadster, etc) compared to the one I can go pick up in the plumbing section of the hardware store?"


I had an experience where I had the same brand of fuel pump you just bought - brand new and the diaphragm started leaking after about 3 hours of use. Not saying that is the issue here but be wary.

I also ended up getting stuck on the side of the road and almost got hit by a car when that happened when I was trying to push my car out of the way. Closest to death for me since I was a youth.
Michael Petryschuk

This thread was discussed on 21/04/2011

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