Okay guys real quick just a little bit about me... I used to be the guy that said Ford never, fixed or repair daily, found on road dead Etc. Now that I've had my 1992 F150 since last year that I only paid 750 bucks for it and it's treating me just fine up until now, so I've got a new outlook on things. Lol okay here goes my problem, my truck has been stalling out while I'm driving, hard sdriving, getting terrible gas mileage. for example I used to get about 12 miles per gallon I'm getting about 4-5mpg now. At first my battery kept dying also so I couldn't figure out what it was right away. Now I changed the battery everything with that's fine, but it's still stalling out, hard starting, sputters at low speed and getting that terrible gas mileage. I'm thinking it's the fuel filter so I just bought a new one and I'm going to change that but for some reason it won't run or start when switched to the front tank at all. I'm wondering if anybody has an idea what would make that happen? Both of my fuel pumps hum when I cycle the key, so it's not the fuel pumps as far as I can tell. Sorry that the first post coming from the prior ford **** talker is me in need of help, but I have seen how much you guys help each other and have already helped me up until this point so I appreciate any insight that I can get from you guys. Have a good day everyone and thank you in advance. Btw My truck is a 92 f-150 with the 5.8 and 215k on it.

 

I think my truck may be doing that moving the gas from one tank to the other thing on its own and does anyone know a fix for that. Or if I can just disable one altogether? Thanks again

 

Just because you hear a fuel pump hum, doesn't mean it's working properly.
You need to check the fuel pressure when switched to each tank.
If you're transferring fuel from the rear tank to the front when switched to the rear tank, the problem is the front tank FDM (fuel delivery module). The fix is to replace it.

 

http://web.archive.org/web/201401031...tion.com/?p=13
Fist thing to do is retrieve codes. This link should show how ,you'll save time, money, and aggrivation. Also check fuel pressure as Phy suggested.