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Triumph TR6 - Fuel Line

Hi guy's

I have replaced the original fuel pump with a new MOSS motors pump and can't get the fuel line to the carbs to seal at the pump end. It is a 1/4" line with a compression fitting, is that the correct type and size connection?

Ken
L Caya

Ken, make sure you got all the parts of the fuel line correct and in place.
DON KELLY

Don,
What are the correct parts?
L Caya

Make sure you have the ferrule still attached to the fuel line
DON KELLY

I have a new ferrule on the line but the compression nut doesn't reach the ferrule.

What size fuel line are you using 1/4" or 5/16"?
L Caya

Where did you get the ferrule?.
Is it 1/4 to the pump and 5/16 past.
Dang, I don't remember
DON KELLY

L Caya, I don't understand..."I have a new ferrule on the line but the compression nut doesn't reach the ferrule." I'd say that's your problem. The ferrule seals the connection. If the compression nut does not reach it, then it's not sealed!!!
db
Doug Baker

db,
Thats my point, I'm trying to find out WHY it dosen't reach the compresson sleeve (ferrule). I'm thinking maybe it is supposed to be a 5/16" line and not 1/4".

What size fuel line do you have leading to the carbs?

Ken
L Caya

Where did you get the Ferrule, I ask again
DON KELLY

Don

I had a spare, purchased from Moss.

L Caya

Good, as they are not your usual ferrule size.
Can you post a pic of the connection?
DON KELLY

Ken,
My line is 1/4" OD; ~3/16 ID so a quarter inch ferrule should fit OK and the nut should draw it up tight. Has it already been compressed shy of the inlet on the fuel pump so that you fail to get a tight fit with some pipe extending past the ferrule? If so, work it off and replace. The ferrule should be loose enough to move on the pipe BEFORE you tighten it down. After that it's likely to compress onto the pipe. Good luck. Hey a whole new pipe's not all that much from TRF. One other thing...make very sure that you don't cross thread the nut or you're in real trouble!! It'll leak and you'll also need a new fuel pump.
db
Doug Baker

db
The 1/4" tube worked well on the priginal pump, but, this new pump has a deeper cavity for the compression fitting. I placed the ferrule in the pump (before I installed the pump) and measured the depth from the face of the boss, it measured .370 on the new pump. The original pump measured .200 deep the difference is enough to allow the nut to bottom out before compressing the ferrule. I am going to try a 5/16 tube and ferrule, this measures .250 deep and does seat well enough in the pump to compress. I'll let you know how it works out.

Thanks for your input it was helpful

Ken
L Caya

Just call Moss!!
DON KELLY

Don
I have been talking with Blaine Graham at Moss (a Tech), he understands the problem and is waiting to hear how a 5/16 tube works out.

If you look at the original pump and the new pump you'll see the difference in the depth.

I also purchased a pump from TRF and found the same dimensions.

Using a 5/16" with its larger ferrule should make up for the different depth.

Ken
L Caya

Are both openings the same?
DON KELLY

Yes
L Caya

What is the size of the "nut"

DON KELLY

about 5'8" and 180lbs
L Caya

Ya know, I almost interceded and put a remark in to squash that.
Little guy,eh?
DON KELLY

The 5/16 tube and ferrule did the trick no more leaking, would have prefered to stay with a 1/4" tube though. To answer your question the nut is 1/2 x 20 .470 in length.

End of thread from my end, thanks all

Regards,
Ken
L Caya

Can't figure why that tube fit's that nut.
What was the part # for the Pump?
DON KELLY

Don,
I bought a 5/16" tube, it comes with a properly sized nut and ferrule. The ferrule being a larger diameter reduces the deth from the face of the boss the nut screws into by over .100 enough to allow the nut to compress the ferrule on the tube. Ref my reply to db

Ken
L Caya

What completely blows my mind is why is Moss selling a pump that won't work with out modification. Makes no sense to me.
Doing a little research on this
DON KELLY

Well Ken. Did some sleuthing and came away with this answer.
It's been so long since I touched the fuel line I had completely for gotten

""The original pump was designed for 5/16 lines (and the special ferrules), Triumph used a special nut to adapt 1/4 line on the output. Actually it's not all that special, the 5/16->1/4 nut used to be a standard hardware item (I found one at my FLAPS, many years ago).""

So guys Our pumps are 5/16th's
DON KELLY

Have to ask; why not just use one of the available rebuild kits for the original fuel pump. Reason I ask - my current original worn out old engine now in the car had a new, aftermarket replacement on it when I got the car in 2004 and it still works fine and looks new (clean). I considered rebuilding the original (with priming lever) pump on the new, rebuilt engine but also thought I might just switch the aftermarket pump to the new engine. Are the available kits not reliable or are the original pumps not readily rebuildable?
Thanks,
Bob
Bob Evans

They are but the rubber sucks.
You need to get the kit from the company Paul post on his site
http://www.74tr6.com/fuelpump2011.htm
They have the better rubber.
DON KELLY

Thanks Don - he's got a great site and Jeff does nice work, huh!
Bob
Bob Evans

Ken ,the problem is the new knockoffs have a deeper inlet and outlet.So you have to make sure the ferrule is not pushed in too far, when you tighten it.
ian white

Ian,
Doesn't the ferrule have to make contact with a mating surface at the bottom of the inlet anf outlet as well as the nut to be compressed?
L Caya

This thread was discussed between 11/06/2011 and 20/06/2011

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