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MG TD TF 1500 - Fuel line route to carbs

Is there any reason the carb lines can't go to the outside of the air filter? That would move them even further away from the exhaust manifold right?
Would it also not help with possible evaporation issues by delivering marginally cooler fuel to the float chamber?
If the main issue with vapor lock is the fuel vaporizing in the float bowls. Would slightly cooler fuel coming into the float bowl make any difference?
I don't have any vapor locks issues so can't really tell if this would help or not. But just moving the rubber braded tubing away from the hot manifold - should be a good idea.
Just a thought.
Rod


Rod Jones

Not having a TD, I might be stepping out of bounds but, it looks like a nice idea, especially in slow traffic where the engine is idling a lot and manifold heat is rising pretty much straight up. PJ
Paul S Jennings

The main problem, as you've correctly identified Rod, is the proximity of the float bowls to the exhaust manifold. I think the relocation of the line, as per your pic, would have only a marginal effect on the already vapourised fuel in the rear bowl. It may have a slightly beneficial effect on the front bowl but again would be negated once mixed with the vapourised fuel there. I understand that heat shields are the only proven method of resolving vapour lock. Cheers
Peter TD 5801
P Hehir

The primary area of vapor lock is in the channel between the float bowl and the carburetor jet (in the arm of the float bowl). Moving the fuel line to the outside, as Peter suggests, will have a minimal affect (if any) on the vapor lock issue. Pulling the choke out a bit will usually chase the vapor lock away after starting. You can eliminate the vapor lock problem by removing the side panels from the bonnet (use a strap to keep the top panels in place). I used to see that done regularly in the summer in Southern California back in the 50s. Cheers - Dave
D W DuBois

This thread was discussed between 01/09/2014 and 02/09/2014

MG TD TF 1500 index

This thread is from the archive. The Live MG TD TF 1500 BBS is active now.