Pre-Power Stroke Diesel (7.3L IDI & 6.9L)Diesel Topics Only
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I have a 1985 F-250 2wd with the 6.9l idi diesel engine. I have been running it for a year off of the front tank and want to begin using the aft tank so I put in some fuel and hit the switch, nothing happened the first couple of times but then one morning I had it in the aft position and the engine sputtered and died, then started right up after switching back to the front tank. Also, when I switch to the aft tank the fuel guage reads empty.
As I trouble shoot this, I want to have a diagram and working knowledge of what is happening in the tanks.
Does anyone have a diagram of the fuel flow?
Are there pumps in the tanks?
Any help greatly appreciated.
1985 F250, dual tank, Lariat XLT, 6.9 liter International Harvester engine, starts first time every time
Not sure about the gauges but fuel lines go from each tank to the fuel selector valve (left framerail, 6 ports in total) then to the fuel water seperator then to the lift pump on the right side of the engine then up to the fuel filter and to the IP. From there to the injectors where the return lines start which go back to the selector valve then one return line to each tank.
Long story short no fuel pumps in the tanks, each tank has 2 lines that go to a selector valve then from there 2 lines to the front.
Far as the sputter then dieing sure you wernt just low on fuel? What happens a lot is inside the tank the fuel pickup will have the end break off so at 1/4 tank you cant pick up any more fuel.
1997 Mazda Miata (DD)
2010 F150 (Tow vehicle/borrowed)
1984 Mazda RX7 (Track only, The Famine Car)
1995 24' Pace Shadow (Car trailer and garage)
1991 F250 - (The Freight Train) - Extended cab, 7.3IDI, 4X4, E40D, ATS 093 Turbo, 3" DP, 4" exhaust, beat to hell and back but still running (needs new body...)
Thanks dtgl90vt, all printed up and ready to roll around on the ground lol...and great avatar!!
Glad to help, I haven't even had a chance to use the EVTM yet, I just got it the other day. I actually have a similar problem as you with the fuel selector, from what I read they can be a pain, and expensive too.
Well I thought I had a section in my favorites about fuel selector valves but I guess I don't
But one thing I remember reading is that these valves oem are expensive if you can find them or something that is made to replace them. But I do remember possibly Ctubutis bringing up in a thread I was searching that there is a universal that someone did a write up on and how to make it work with our trucks.
I forget if I did the search here or in the 80-86 forum, but I would imaging the 80-86 forum, cause I think he is a gasser
but I hope you don't mind cause I need to hijack your thread
After reading, there is reference too there being pumps in the individual tanks? I believe the 6.9l is a mechanical pump up under the hood, rather the only thing in the tanks are Fuel Gage Senders which is the float that lets the gage know how much fuel is in the tank, not an actual pump. Correct?
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