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  1. Sergey

    surprising mileage.

    Ah, so yours is 5-speed, then why not 19 mpg hwy. The best habit I used with T18 is to aggressively use neutral gear to just let the truck roll where possible. As for timing my truck never had one checked or adjusted, not sure if it is worth to put any money into a worn 35-year old motor. It...
  2. Sergey

    surprising mileage.

    Really ? Days back I experimented how to get the fuel mileage on my 85 with 6.9 and T18. Never got above 16 mpg despite what I tried and about 12 in city. Yes tried shift up at 1200, also at 1500 rpm. It shifts and accelerates slowly, but mpg was still low. Then years passed I gave up to worry...
  3. Sergey

    Wood u buy a high mileage turbo 6.9?

    This sounds very familiar (but me have nothing to do with firefighting). In fact this is exactly my plan to keep my truck the same way. And yes age etc. and circumstance change may happen As for the high price, it is California price after all. And did he install Gear vendors too - that is...
  4. Sergey

    Aft-axle fuel tank access on 85

    Thank you kindly. My truck sits in Bellevue, on soil, there is no garage nor shed. It would be brutal to ask for help knowing that work will take place outdoors given the weather. Due to the latter I do not plan to deal with rear tank till summer. Perhaps then I may seek help. Thank you for...
  5. Sergey

    Aft-axle fuel tank access on 85

    You all are wonderfully skilled and so handy. I could not have that gap described above on my 1985, since frame cross member blocks access to both fuel line connectors. So I was lowering rear tank with fuel lines connected, severed blue line, repaired it, but apparently damaged something else...
  6. Sergey

    Aft-axle fuel tank access on 85

    Finally I fabricated 3/8" to 5/16" union for nylon fuel lines. Installed it on my truck and drove to gas station to test. Put 7 gal of fuel into rear tank, switched engine to rear tank and idled at gas station for 6 minutes. Checked under the truck and found no leaks. That's encouraging...
  7. Sergey

    Rear main seal leakage - should I use a stop leak? [1994 IDI w/ turbo]

    My 85 F250 when viewed in that area looks similar. Oil drips onto exhaust pipe, boils and partially burns on it. Replacing rear main seal is not on my roadmap. Additives did not help at all. Inspection cover missing causes oil spray over wide area - cover was lost a while ago, did not find...
  8. Sergey

    Aft-axle fuel tank access on 85

    For the same diameter of nylon pipes - yes. But I need to join different diameter nylon pipes - remainder of original 3/8" blue line to new 5/16" from new push-on connector. Something like this would work perfect, if it were made for nylon pipes.
  9. Sergey

    Aft-axle fuel tank access on 85

    When I realized the trouble I got into by damaging nylon fuel line I did in fact re-visit the option of removing truck bed. Went under the truck and located six(?) carriage type bolt ends holding truck bed to frame cross members. All six ends have significantly rusted nuts. Tried to loosen...
  10. Sergey

    Aft-axle fuel tank access on 85

    You are very right on that, never again.
  11. Sergey

    Aft-axle fuel tank access on 85

    Ordered 3/8" to 5/16" pipe union from amazon https://www.amazon.com/gp/product/B008ROV4EM/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1 it is described as Compatible Pipe Material: Copper, Aluminum and Plastic Arrived today. Maybe they mean some other plastic, but my nylon fuel line...
  12. Sergey

    Aft-axle fuel tank access on 85

    Hello, well... to tell the truth rear tank removal and install procedure (without removing truck bed) ended up with what I was feared for. While maneuvering rear tank I damaged blue nylon fuel line, it became kinked, and then its push-on connector also sustained damage (not visible on the...
  13. Sergey

    Aft-axle fuel tank access on 85

    Thank you for posting pictures. These are helpful. Electrical connector on my 85 rear fuel tank sending unit appears to be identical. I finally managed to get it off sending unit. Fuel line connectors are different! On mine there are two different diameter connectors, one smaller diameter...
  14. Sergey

    Aft-axle fuel tank access on 85

    Continued this work. Spent some time to clear tar, mud and gum from electrical connector of sending unit. Worked blindly (i.e. without seeing it) as I cannot lower rear tank enough to stick my head there, using wood chip as tool. Now I can feel there is a tab on this connector head. Can anyone...
  15. Sergey

    Rear Tank Help

    Hi, may I ask you how did you drop aft-axle fuel tank? Did you pull truck bed or not? If not, then did you perform that procedure of lowering tank at angle just enough to unplug fule lines and electrical cable? Or some other procedure? Thanks
  16. Sergey

    Aft-axle fuel tank access on 85

    Thank you for your helpful replies. To clarify about the goal. For the last 15 years or so the rear tank in my truck only takes about 11 gallons of fuel, while being stock with 19 gallons capacity. I did not bother/was not able/health issues/etc. for so long to investigate it. I probably would...
  17. Sergey

    Aft-axle fuel tank access on 85

    Thanks for the advise. It does not seem that dropping rear tank a little bit will help in my case. Doing so will just stretch fuel lines and electrical cable by pulling them down. I would avoid putting such strain on 35 years old electrical cable or nylon pipe (will try to attach photo to aid...
  18. Sergey

    Aft-axle fuel tank access on 85

    Hello forum ladies and gentlemen from a new member. I am long time reader of this forum - thanks for all the help that I've gotten from the collective wisdom. I own 1985 F250 with 6.9 for the last 25 or so years, and used to know it from the inside. But getting older .... so it is time to...
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