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help rather strange problem

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ade666:
hi all. rather strange problem with my 300 tdi.the engine just  stopped this afternoon. thought i'd snapped the dreaded but a little turn of the key and it made an attempt to start. so popped the bonnet made sure everything was in its place sprayed every thing with  wd40 includine the altenator. turn the key and it started for a second or 2. so took off fan belt and it started and ran. all the pully things spin ok.  any ideas as i'm out of them. it happened on a previous engine which we found out was a siezed alt. but it spins free with the belt off


please help

beast5680:
so it was running but stopped... now it wont start and run but if you remove the fan belt it runs?

ade666:
yep thats it. its the strangest thing. i wondered if the tensioner has got too tight but its hard to test this out

hobbit:
Crack the injector pipes to the injectors, see if you get a flow of spurts of fuel out of them, may be restricted flow, fuel filter, re-bleed

Fuel cut off solenoid feed wire, the list is endless

beast5680:
tensioner shouldnt stop it running though :? something must be stopping it running, does it turn over with the belt on? not something like the steering pump seized although that only drives on the back edge of the belt does it sound like a problem where the engine is struggling to turn over or is it suddenly being cut out like with an electrical problem? or fuel problem?

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