Well I find it easier to take the bed off to do both tanks and it not a bad job as long as the bed bolts come out OK. Do not forget to unplug the bed before you take it off.

Here is your electrical diagram.
http://i54.photobucket.com/albums/g9...el1991F150.gif

 

Subford,
a quick appendix to my query.
Where do you find all these useful (electronic) images?

I travel a lot, and having something available on the laptop, would be excellent.


TX F-150

 

Hi subford,
the vehicle application says it applies to my '91 F-150 (5.0L 4x4).

You sent a different schematic to w/o the mechanical selector.

Are these schematics for different engines?

Am trying to understand the nuances of the F-series.

thnx
TX F-150

 

This one was used on Ford trucks through 1989 and then they changed to the system you have.
It does not say it applies to your truck, it says 1986 and later years and was copied out of a 1989 Ford Engine/Emissions-Diagnosis Shop Manual. So your trucks system had not came out yet when this image was made.

The 1990 on system diagram is from a 1992 Ford Engine/Emissions-Diagnosis Shop Manual.

 

Most of the Electrical Diagrams I drew myself and they would not be found anyplace else but this site.

 

Thanks subford,

Speaking of images. Visited your photo bucket. Did you scan those images yourself or find'em on the web?
btw, nice collection.

TX F-150

 

Thanks for the update! I thought he had the earlier system. It would seem that both fuel delivery modules are bad since fuel is transferring both ways???

 

I have been dropping the tanks down just far enough to work from the top. I can have the front tank changed out in less than 30 minutes. Rear is a little more of a headche if the fill hose has to be pulled loose. But if you are a big guy, the bed may be easier to do. The bed is heavy and you need a safe way to lift it off. I work solo and dont usually have an extra 4 to 6 hands to help out.

Subford, your diagrams are very nice and helpful. Do you have a link to the whole lot of them??????

 

Sure the current posting are at:
http://s54.photobucket.com/albums/g91/subford/

These are not as clear as the ones I can send to your email address.

 

Glad to see everyone is getting there problems fixed. Mine are still in the works. Rebuilt engine in the shop almost ready for a engine swap and that same sending unit still in there. Maybe I will change it out when I swap engines. I still need to put my guages back together before anything else goes wrong so I can at least read what the heck is going on. We'll see what happens. For right now I don't want to get in over my head. So the guages and finishing up on painting the frame are my only projects for now until the new baby comes in, the whole nine. Then most the hard stuff will be over with except for that body work and paint.

 

alright this is a little off subject but i have a question about the 2 tanks. lets start at the begining. i have an 86 4x4 f150, single tank , and a carb and i have an 88 2wd f150, dual tanks, and its efi. im getting ready to swap the body off of the 88 onto the 86 and i was curious if there is any way i can still run the dual tanks or if that only works for the efi?

 

Not a 100% sure of your question but I see no reason you could not mount the tanks on your 86, I have an 87 tank mounted on my 82 RV.
If you are still using the carb on the engine then you need to bypass the Hi-Pressure pump on the frame and not use it at all. Just replace you filter/reservoir with the Mechanical selector/reservoir if you now have an in-tank pump. You can then bypass or run through the engine-mounted pump if you have one.

You need to explain a little more what you are doing so we can help you more.

 

what do you mean i thought i explained exactly like im gonna do it but let me explain it again for those of us that weren't paying attention. i have an 86 4x4 with a carb. that the body is shot on and i have an 88 2wd with a messed up engine and it has two tanks. i already know the body swap wont be to bad but the thing is the 88 body has two spots to fill up gas but the 86 only has one tank so i was wondering if it would be easier to patch up one of the spots or if i could get away with putting the tanks off of the 88 onto the 86(mind you the 86 is not fuel injected but the 88 is)...now i hope that clears it up for you buddy

 

"You need to explain a little more what you are doing so we can help you more".
This was badly worded, what I needed to know was:
Did the 86 have a fuel pump on the engine or one electric one in the tank?
Are you going to use FI or carb when you are done?

I am sorry as I though you were asking a fuel question and I had no idea you were asking a body repair question.

 

im not really sure where the fuel pump is yet i havent got under it all that much(the truck was just givin to me) im gonna run the carb. the only thing coming off of the 88 is the body but like i said it has two filler doors on the bed and the truck im putting it onto only has one tank......i would like to run the dual tanks but i dont know if i even can do it.........so to be clearer,can i run dual tanks on a carbed engine?