Hi all, for the first time in nearly 7 years of ownership, I'm suffering fuel vapourisation in the warm weather, i.e. hot start probs, this has only started since I fitted those nice stainless braided fuel hoses, the one from the filter to the carbs even feels hot to the touch. Before I junk them, has anybody else had a similar experience ? or could it be a co-incidence ? Nice to look at and expensive so I'm a bit reluctant. :? Martin.
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I have had hot starting problems in the past, I think it was the float chamber vent bypass valves that were sticking. I rebuilt my whole carbs so I can't be sure. I have had no hot starting problems since though.
Rgds
Dave
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Martin,
Sorry to have to say it but, in scientific terms, they could be reducing heat outflow - by radiation - from the pipes, so allowing the fuel to vaporise. Black heatshrink over them might, perhaps, help. However, I think the effect of either 'silver' braid or 'black' heatshrink is likely to be minimal.
I'm sure the real solution, which might become necesary if global warming comes about, would be a return line to the fuel tank.
Peter
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Martin ,Is it just recent , has this been for a longer time than , you last filled your tank ???
I have the same type of hoses as you , only have problems with supermarket fuel
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Martin Stevenson wrote:Hi,Hi all, for the first time in nearly 7 years of ownership, I'm suffering fuel vapourisation in the warm weather, i.e. hot start probs, this has only started since I fitted those nice stainless braided fuel hoses, the one from the filter to the carbs even feels hot to the touch. Before I junk them, has anybody else had a similar experience ? or could it be a co-incidence ? Nice to look at and expensive so I'm a bit reluctant. :? Martin.
I have the braided hoses from the filter to the carbs, but where they run under the air filter assembly, i've insulated them with foam pipe insulation to prevent heat soak from the head. No problems so far.
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Hello, remember not long ago when we had a very hot day and my car broke down(vapour lock) and I wrote about it,.....the fuel hose was absolutely hot, amongst other things.
Well this is what I done about it.......I have a feeling you will have a laugh about it, but it looks good it polishes up to a high shine and takes the heat, the holes in it have a way of cooling the hose under it, but all in all the fuel hose remains cool and the aluminium takes the heat.
It fits the fuel hose as if it was meant for it, the little curve fits the fuel hose as it attaches the weber to a tee. The bottom bit I used to cover the header tank hose,...all it needed was a bit of cutting........................................... ...................my Dad's old walking stick. Thosewho have seen it at the Ace cafe liked it:P.Cured my vapour prob I think.....
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p.s you have to take the rubber bungs off, of course.PLEASEno leg pulling
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Cor,You went out on a limb posting that Suhk.
Steve
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Thanks for the thoughts guys, anyone else please ? :? Martin.
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Hi Martin
There are two thoughts on this.
1) The needle valves are leaking and petrol is creeping past when the engine is turned off and the system is still pressurised, causing flooding.
2) Vapourising of either the pipes or carb bowl. A heat shield under the bowl could be an answer.
Usual remedy is to floor the throttle pedal and crank the engine, as you would if it was flooded.
Bob
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Hi Bob, I'm now on my sixth set of needle valves, changing those buggers again is a last resort
I've been using the floored throttle technique to get started, that's the only thing that works. I'll try the heat shield idea, thanks for that. Cheers, Martin.
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Martin Stevenson wrote:Hi Bob, I'm now on my sixth set of needle valves, changing those buggers again is a last resort
Hi Martin
I feel with you. There is a litle note in the manual (Fuel System 19.15.17 para 42): ........adjust by bending tabs ensuring that tab sits on needle valve at right angles. It worked for me.
I think thats to avoid a lateral force on the needle shaft.
Klaus
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Hi Martin
My hot starting could be a bit hit and miss - over the winter I fitted a electic fan in front of the rad, standard one is still there, only fitted it for peace of mind. I have wired the thermostatic switch so that it will run after the engine is turned off which it does a fair bit in this weather, this seams to have helped a lot. I assume it reduces the under bonnet temp just enough.
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Between the ali radiator and the electric fan I've pretty much got my cooling sorted, short of fitting an underbonnet extractor there's not much more I can do in that direction. I'm VERY grateful for all the suggestions, PLEASE don't stop ! :? Martin.
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Not so much a solution, but i can confirmation that i run with S/Steel braided fuel lines running from the engine bay fuel filter to the carbs, and i have not suffered from vapourisation problems
perhaps i have just been lucky ...........Andy
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Thanks Andy, that's positive and leads me to look for another solution. Martin.
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