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MG TD TF 1500 - Carb progress - MORE SMOKE!

So I solved my rich fuel / black smoke problems; removing washer #33.
The front carb had been empty both days when I checked in the morning; I discovered why - a steady leak from the jet/idle assy. Boiling fuel on exhaust manifold. Not good!
Time to strip again and replace cork seals. Might as well do both carbs!
Next day: OK, both carb seals replaced everything reinstalled. Make sure choke return springs are in place :)
Everything looks great AGAIN! Engine starts instantly, idles beautifully...

And once again, SMOKE OFF ENGINE!
This time, it's the pump to carb braided steel/Teflon fuel line, with fuel running down the line all the way along (must be cracked inside near the pump connection). Both connections clean, tightened down well. Still, fuel dripping onto manifold once again to create clouds of smoke.
This fuel line has NEVER given the slightest problem until today.
Ordered a new one, should be here in two days.

Two steps forward, one step back...
Geoffrey M Baker

Geoff,
There is no logic re the fuel hose letting go . Mine had worked fine since coming to the USA for 9 years then all of a sudden they just sprayed fuel. I put it down to Ethanol and replaced them both - pump to first carb and carb to carb.
It is not worth the risk to leave any of the older rubber in the system.
The new ones "I am told" will not be effected by the "new gas".
Also I would give some serious thought to the O Rings supplied by Tom Bryant [thosbryant at gmail dot com] up here in Maine that replace the Langite gland seals on the jets {two in place for each old seal} and one each for the jet nut.
Sometimes Modern technology is better. Even if the old ways do work :)
Rod.

R D Jones

I have had the braided hoses from the fuel filter to the carbs in our MGB let go. I threw them out and replaced them with non braided, fuel injection flexible lines. I will never go with armored (braided) hoses again - you can't tell when the line is deteriorating. Cheers - Dave
David DuBois

Dave, how did you connect your new lines? Are there barbed ends available for the end fittings and if so, what size and thread are those fittings (some obscure British pipe fitting I assume?)
Thanks!
Geoffrey M Baker

Rod,

I already contacted Tom Bryant; he's on vacation but I'll get back to him in a month. Given the number of times I've already had to tear the carbs down, Teflon O-rings seem the way to go...

Can anybody recommend the best hoses to use for pump to carb and carb to carb? And how can I set up the pump to carb hose given the threaded fittings on pump and carb?
Geoffrey M Baker

Geoff,

I went with the STD new braided hoses from M via LBCC. So far no problems and all the fittings are already there.

When you mount the little O rings to the jets [two at the top and two at the bottom]. Do as Dave DuBois suggests and make sure there are no sharp burr edges on the small hole in the jet that could nick the O rings. Should you extract and replace the jets. A gentle chamfer is good [small round file].

Do follow Dave Braun's PDF on how to set the fuel height in the bridge. By adjusting the fork height in the float bowls. Make sure both fuel heights are at the same depth - give or take a few thou. :) It is really the only fiddly bit. Wear a back brace :)

Rod
R D Jones

This thread was discussed between 29/04/2014 and 01/05/2014

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