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Fuel heat exchanger; Can it be by-passed?
Topic Started: Thu Dec 4, 2014 11:59 am (265 Views)
PaulaAlicante
Newbie
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Hi. I live in the south of Spain and have a 190D 2.0 (55kw-75CV) year 1992 with motor 601.911.
Because of a fuel leak under the injection pump, I was refered to a pump specialist. He found that the leak was from the fuel heat exchanger. He said it is not necessary to heat the fuel here in Spain because temperatures are never very cold. So he connected the gasoil pipe directly to injection pump, by-passing the fuel heat exchanger.
Did he act correctly?
What might happen if temperatures drop to -10ēC (ten below zero)?

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eagle3
Therapy Needed
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It's not essential.

I have a Peugeot J5 which has a bypassed heat exchanger and it gets pretty cold here in the winter(or can do). They are known to cause running problems when they start to leak.
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shrekky
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as said it isn't essential, by-passed mine years ago. it doesn't work 100% of the time anyway because the way the heat exchanger works from the water system , so if you think about it ,it doesn't start actually warming the fuel until the engine is at least warm ;)





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PaulaAlicante
Newbie
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Thank you, Eagle3 and Shrekky, for your kind reply.
However I don't understand why, if the fuel heath exchanger is not essential, diesel cars have it.
When is it necessary?
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shrekky
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it was necessary when these cars were built, as the technology in fuel wasn't so advanced and diesel was really prone to waxing, diesel has so many additives now to stop this happening, plus it would be necessary in colder climates (finland , Norway), as freezing air rushes around the engine bay it could cause diesel to wax up (even with the additives) so if you warm the diesel up even by 1 or 2 degrees its enough to stop this from happening.



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