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seen May 13 at 9:13

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comment what can be the reason my old diesel Mercedes won't start?
I am the original poster, and now I know its nothing to do with glow plugs or glow plug relay. If the fuel tank is full, it starts instantly even after sitting many days in the cold. And if I leave little fuel in the tank, it takes 2 minutes cranking to start even when kept in a heated garage. The observation of starting on "warm days only" was because on warm days the old battery had enough juice to keep the starter running long enough, now I have a new battery and can start it even in cold winter, with little fuel in the tank if I keep the starter running for 2 minutes.
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comment what can be the reason my old diesel Mercedes won't start?
This is what I believe now is the most likely cause, given these observations: the motor starts instantly even after not running for many days if the fuel tank is full. If I leave the tank with less fuel, then after a day or two the first time I start I have to run the starter for 1-2 minutes.
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comment what can be the reason my old diesel Mercedes won't start?
I mean does it makes sense to heat up the fuel pump and/or injectors with some portable hot thing to be able to start the vehicle that way until I run out of fuel. That way I don't waste 3/4 tank of fuel which is worth half of the price of the starter.
Jul
30
comment what can be the reason my old diesel Mercedes won't start?
thaks for all info, I will try that. I also read elsewhere that heating up the fuel pump and/or injectors with a hot-air blower can help, and it makes sense as the vehicle starts without problem till the engine is still warm. Does it make sense? Then I could use that method to start it until I use up all the old fuel (unfortunately I have 3/4 of the tank full), and then change the fuel filters, as if I change them before I get rid of the old fuel, they'll just become clogged again, no? P.S. I already just (needlessly) changed the starter for 100 EUR so now I have two good ones.
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