[Vwdiesel] Cold Start 1... Hot Start 0

[Mark Shepherd]

No particular air leak detected, and if there were when hot, then surely prime would be lost whilst hot, whereas leaving till cool or overnight results in instant, 
or near instant start.
I can't quite rationalize the pump priming itself after any losses, whilst being stationary.

I do have a substitute pump, but it has been stood in my shed for maybe 10 years, and I don't want to introduce new, but different faults, although they may 
be easier to cure :o)

Mark


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Message Received: Jul 09 2014, 03:11 PM
From: "Doyt W.  Echelberger" 
To: "Mark Shepherd" 
Cc: 
Subject: Re: [Vwdiesel] Cold Start 1... Hot Start 0

OK, you say "that leaves fuel supply at start up" as a high 
probability situation. Have you considered an air leak in your fuel 
supply line, that is sucking bubbles of air into the pump, thus 
diluting the volume of diesel fuel that reaches the cylinders? Doyt
>>>>>>>>>>>
At 08:54 AM 7/9/2014, you wrote:
>Thanks for all the replies. I have driven it without the solenoid 
>plunger, and it's not failed with it out, yet, but, having said 
>that, after that 2 mile run, in a rush last week [perhaps making the 
>pump hotter than normal], I took the solenoid plunger out after 
>restart failure, but it made no difference when hot, and the AA man 
>came about half an hour later, and it was still out, with the pump 
>luke warm, and his initial tentative use of Ether, and then generous 
>direct squirts beyond the filter, failed to get the engine to go 
>beyond a stutter. Stalling the engine with the clutch is not much 
>fun, especially as it has a clutch that has been slipping recently. 
>It needs replacing, but I've forgot which size is already in it! 
>Today I did an 8 mile trip, broken up in the middle with an hour and 
>a half stop. No issues. Returned home, stopped the engine counted to 
>10, and tried a restart. No problem. The trip was quite leisurely 
>paced. I think that the issue occurs when engine is slightly pushed, 
>and then it seems to remain, until cool. I suppose most journeys 
>such as going to work, visiting friends, or a lengthy shopping spree 
>etc and this fault will not show itself. Forcing the glowplugs on 
>with a jump did not cure it. Thus I'm now down to the apparent low 
>volume of fuel in the fuel lines at hot start-up. The solenoid has 
>now been discounted, and that leaves fuel supply at startup. Fine 
>when cold but, not when hot, maybe when warm. I cannot see the vane 
>pump being an issue as it is fed diesel from the tank, with no 
>recycling at the fuel filter. It really must be linked to the 
>special lever mentioned in books, that holds the spill-off sleeve 
>over and beyond maximum fueling, for driving. Compression likely not 
>great, but certainly better than it has been for many of the 7 years 
>or so of driving this engine! Constructive comments welcome, even 
>rude ones might be worth a look Lol Regards, Mark Mark 
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