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heat protecting fuel pipes

Technical issues not related to a DLOC car marque, eg tyres, ethanol, other car makes, etc. and legal, political and insurance
ranald
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heat protecting fuel pipes

Post by ranald »

I think my fuel pipes might need some heat protection as they are routed behind the engine block and enter the carburettor quite close to the exhaust manifold. I've had some engine cuts outs recently which could well be fuel vapourisation. There seem to be a few products available. Has anyone any recommendations? Thanks.

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captain bobo
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Re: heat protecting fuel pipes

Post by captain bobo »

What model of car?
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Re: heat protecting fuel pipes

Post by Warsash 2 »

Hi
I used, very successfully on my V8 250, the pipe insulation used by hydraulic pipes on heavy plant. Try yellow pages for your local hydraulic specialist.
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Colin

ranald
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Re: heat protecting fuel pipes

Post by ranald »

Its a Lanchester 15/18.

grahamemmett
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Re: heat protecting fuel pipes

Post by grahamemmett »

Hi Ranald
On my DB18 the standard route for the fuel pipe is across the front of the engine via a clip on the thermostat housing then over to the carb. This is a perfect fuel vaporisation scenario. At some pont my car has had a modification to be similar to what you decribe on your 15/18 where the fuel pipe is routed quite high on the bulkhead round the back of the engine. It's a copper pipe and attached by insulated clips. I'm certain that this re-routing is the reason that I don't suffer any fuel vaporisation so I'm surprised that you do.
I'd be interested to learn if sheathing the pipe cures your problem.

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Graham Emmett ¦ DLOC Chairman ¦ chair@dloc.co.uk ¦ 07967 109160
Northwich, Cheshire
DB18 1949 LCV522 (Yes that one with the P100s)

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John-B
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Re: heat protecting fuel pipes

Post by John-B »

Copper is a good conductor of heat while plastic, rubber and some other materials are less good, so is it the copper that causes the vaporisation in a position where other materials might be OK?

grahamemmett
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Re: heat protecting fuel pipes

Post by grahamemmett »

You're quite correct John, I think I'd better go and have another look at mine
Graham Emmett ¦ DLOC Chairman ¦ chair@dloc.co.uk ¦ 07967 109160
Northwich, Cheshire
DB18 1949 LCV522 (Yes that one with the P100s)

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marchesmark
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Re: heat protecting fuel pipes

Post by marchesmark »

You can get heat protection products from most of the usual suspects. I have used Agriemach in the past and been pleased with their stuff.

https://www.agriemach.com/

One chap I know with a lot of pre-war cars believes that fuel vaporisation is often not to blame, and he thinks it actually doesn't happen that often. It can be a combination of poor routing, ensuring there are no high points where bubbles can form, ensuring the fuel pump is in good condition (electric pumps seem less prone to suffering from this) and making sure the car isn't running too hot.

Even so, it does still happen. I used to have a Rover P6 3500 and they were notorious for it. I carried a can of water and a rag in the boot, so I could cool the fuel pipes down if it stopped. Eventually I rerouted the pipes.

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Re: heat protecting fuel pipes

Post by Johnsson »

Ranald,

Are you absolutely sure about this. My Lanchester has the fuel lines in the same place in a much hotter climate and I don't have a problem. Have you checked the gauze filters in the fuel lines in the bottom of the fuel tank? Mine were blocking and I eventually punched holes in them and put in an in-line fuel filter. I have some new gauze to replace the blocked filter but haven't done it yet.

Trevor

ranald
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Re: heat protecting fuel pipes

Post by ranald »

Trevor, Thanks for your reply. In things mechanical or electrical, i,m never sure! I take your point about the tank filter and confess it is a job I keep putting off. Last weekend I did a very arduous rally with some VSCC friends, the first 30 miles was on unclassified roads with steep climbs and descents (i'm in North Wales where it is quite hilly). The engine died after 1.5 hours of running when I had stopped to let another car pass in the opposite direction. It wouldn,t restart immediately but started instantly after 5 minutes or so. My VSCC friends though fuel vapourisation was the cause. This is apparently more common with modern fuels. I wonder if your fuel has the same levels of ethanol? Anyway, i've bought some pipe insulating tube from Demon Tweeks, Wrexham; it can't do any harm. By the way, i,ve already fitted a new coil. Promise I will look at that tank filter!

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