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83 6.9 idi hesitation and stalling
I'm new to diesel and to these boards, let me start by appologising if there is a more appropriate forum to have posted in.
I recently aqquried a 83 6.9, the truck is really an 83 f250 standard cab with a duelly long bed and duelly rear end. This truck was origionally towing a speed boat and the rear is geared for towing. It's got a 4 speed manuel and two tanks.
I'm new to diesel and to these boards, let me start by apologizing if there is a more appropriate forum to have posted in.
I recently acquired a 83 6.9, the truck is really an 83 f250 standard cab with a dully long bed and dully rear end. This truck was originally towing a speed boat and the rear is geared for towing. It's got a 4 speed manual and two tanks.
Now this truck sat for 6 years but ran great when it was taken off the road (I've driven the truck years ago while it was still driven regularly). As i went to put it back on the road i manged to throw two fresh batteries in and get it started.
Long story short the truck starts and runs but it doesn't run right, sometimes it shuts off on its own, other times it will idle all day but will stall if I blip the throttle. If I gently ease into the throttle and gently let off the throttle the truck wont die but throttle response is extremely laggy.
I started by throwing treatment in the front tank and a few gallons of fresh diesel, I also removed the duel tank selector valve and am only running off the front tank , I thought I could have been drawing air from a faulty valve and never seemed to switch to the rear tank anyhow. I removed it to make the truck easier to diagnose.
The truck still acts the same regardless of my efforts. When I bleed the air from the schrader valve on the fuel filter housing the truck sometimes runs better and sometimes stalls but I don't think I should have to repeatedly bleed the system. While the truck was running halfway decent I pulled the relief (or purge) on the water separator and discovered that it was bone dry.. I removed both the 'in' and the 'out' lines and started the truck and found nothing came out from the line marked 'in'. I also discovered that the line marked 'out' had suction.. none of this seems right to me and I'm hoping someone can shed some light on the situation.
I don't know if I have a clog or if something is wrong with the transfer pump. Where exactly do the separator lines come from? Is it before the fuel pump, is it before the the fuel filter housing? Is it on the return side of the system? If the separator is dry how does the truck still (kind of) run?
Sorry if my questions seem a bit novice I am an experienced mechanic but still new to diesel, I tried doing a google search to see if someone has a diagram of all the fuel lines and where they end up but I've had no luck.
Something tells me I'm not getting enough fuel to the injector pump or I still have a problem somewhere that is introducing air to my system.
A thank you in advance for any help