i just got my truck finished, rebuilt it, and have put probly 650 miles on it with no problems, well christmas eve night i went to start it and it cranked for probly 7-10 secs then started, well the rest of the night and a day or so no problems then it comes back again, it only happens when i drive it shut it off for up to, 2hrs rand it will do it, if it sets over night or for along period of time no problem, changed fuel filter, no change even though it was pretty dirty, im 99.9% positive its the in tank pump because when i turn key i dont here it, then when i bump starter is kicks on a truck fires right up, any ideas or experience with this problem, your advice would be greatly appriciated, also no warranty, rebuilt title, sorry for the long post,
thanks seth
truck is 05 dually quad cab, 4x4 6-spd, 35,000 miles bone stock

 

the in tank filter only runs a short while unless you crank the truck once it build pressure i think it stops,you could try opening your water drain on the filter and turn the key on and see if fuel flows if it doese mayt not be in tank pump

 

mine cranks hard sometimes like that when its real cold or after sitting

 

thanks ill try that and see if it is it, also could my fuel press, be leaking off or something makeing it hard to start

 

they just came out with a hard to start flash, mine did the exact same thing now it's good. Now if they could just figure out how to make it die quitly and not idle way down between shifts i'd be good.

 

cool, did they do that under waranty or did you pay out of pocket, thanks

 

no it was a warranty paid even had them change my tire size finally

 

ok ill call them tommarow, thanks alot, did they say what was causing it

 

something about the crank sensor not picking up correctly and the flash changed the way it read it some say a new clutch and single mass flywheel solve this to but i've been trying to research that

 

Weak battery/low voltage can also cause this.

 

thats cool, i wonder if a roktech sensor would help, ill check the batterys

 

I wondered if the roktech would help also let me no if it does.