My truck wont start

Does it do it hot or cold , after driving the truck for awhile or sitting overnight ? Heat can cause resistance problems , electrically speaking . Have you checked to see if there is spark or fuel pressure when it won't start ? If you narrow it down to one or the other it makes it easier for diagnosing . No Start Diagnostic Basics EricTheCarGuy

Probably a bad fuel pump.

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Have you checked for spark and fuel pressure while it will not start ?

I would need to know what is missing when it won't start to advise you.
You need spark at the right time and fuel to the injectors for it to start.

starting problem ,takes 4-5 times turning over engine then blue smoke comes out of exhaust ,is very reliable when got started though -
ive replaced battery/glowplugs-&-relay/
a recovery man says no power to glowplugs ?
can you advise ?

check fuel pump maybe bad pump or connection

As with any no start issue, you will need to figure out if you are dealing with a no spark or no fuel pressure problem to proceed.
I would check those things the next time it will not start.
Could be a relay, coil, sensor, or other component.

I HAD SAME PROBLEM, ENDED BEING CRANK SENSOR GETTING WEAK, AFTER HOT THE CRANKING SIGNAL IS TO WEAK TO TRIGGER FIRING.

next time it wont start, spray some starter fluid into the air intake on the engine, if it fires then you have spark, if not.....prolly a spark issue.

It might be a problem of battery replace the battery it might be not charging properly