84 f-350, 6.9l t-19 2wd starts and idles good, starts driving great. After about 5 minutes on either tank, there is an engine surge( like the meter valve on the ip opens fully) then it runs erratically for about a minute, then dies. will not crank back up right away. take off the fuel filter and it is dry. I have replaced ALL components of the delivery system; also replaced all rubber hoses and clamps. have dropped front tank, replaced sending unit with new pickup tube. Gang, i cant drive my truck for fear of it quitting on me. have had this problem for 2+ years now.
have not replaced the injector kit(hoses that connect the injectors) yet. is that what i need to do ?? need advice where to go from here

 

What about your injector pump, how old , has it been replaced ?

 

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welcome to FTE.
your problem does not sound like the injector pump or return lines, it is before that.
when it dies and the filter is empty is the time to start troubleshooting the fuel delivery system.
pull the line off the filter input and crank the engine over and see if you have fuel going into the filter.
then pull the line off the lift pump and see if there is fuel coming out of it. then see if there is fuel going into it.
somewhere between the fuel pickup in the tank and the fuel filter there is a blockage.
it could be a collapsed fuel line, or there could be something floating around in the tank that blocks the pickup.
you could also try using an external fuel source like a boat tank hooked up to the lift pump to eliminate the lift pump and lines going to the filter. if it runs fine with the external fuel source, you know the problem is between the pump and tank.
then it is just a matter of moving the external tank connection back along the line until the truck dies and you will then know where the blockage is.

 

the injector pump was swapped out a couple of weeks ago, ran as usual. died about 5 miles from the house. there is fuel on either side of the pump (has a mechanical, OEM, temporary replaced with an electric pump). good feed coming to the pump. all the rubber lines have been replaced, and clamps. the metal lines don't show any signs of collapse or other damage. the front tank has been removed and the sending unit replaced.

 

I recently ran out of fuel in a truck that I just acquired. A few moments before the final stall in the middle of the road was the rpms would rise and drop. I though it was the darn shoes I was wearing but it was the last of the fuel.

 

even more reason to say there is a problem between the tank and pump.

 

right now both tanks are about 2/3 full or more.
tryin to find out what the problem is. i have done everything i know to do. it does run for a longer period of time on the rear than front, but does shut down on the rear.
any ideas would be greatly appreciated.

 

like i said, remove the fuel tanks from the system and hook up a portable tank like an outboard boat engine tank. this way you can hook it to the lift pump and go for a ride. it will give you 6 gallons so you will be able to go a while before worrying about running out. then start working your way back to the tank. when it dies on you, you will then know the problem is in the line between where it died and ran good.

 

If you haven't yet check the tank selection valve. Mine did the same to me a couple years ago. Valve was stuck half way between tanks, drawing from the back and returning to the front. But it couldn't draw enough to keep the truck running under load. Once it started dying I could pull over and let it idle for 10 minutes and it would "catch up." The reason I caught mine right away was because it was pushing fuel out of the breather on the front tank. Which due to fuel problems I had stopped using years before but had left full to keep it from rusting.

I don't know how to fix the valve short of replacing it. I just bypassed my selector valve and ran the fuel and return lines straight to the back tank sending unit. If you've got the nylon lines like I do there are barbed fittings for splicing at orielys and they are super easy to put on if you warm the lines up in hot water or with a heat gun first. Then they'll stick so tight when they cool that you couldn't pull then apart if you tried. But again heat will loosen them right back up. Not really the best fix I did mine when I was in college gleaning the left behind potatoes out of farmers fields for food. Needless to say I didn't have a lot of money at the time and I didn't drive much so the limited capacity wasn't an issue.

 

thanks Joe, replaced the valve about 8 months ago. have bypassed it, still happens, so i know that is not it.