i am looking to remove my rear tank on my 90' Ford F150 Lariat XLT and im not sure what to do after removing the tank and fill tube, dont want to be in a bind here once i start jerking off all the parts. the story is, i couldnt find a proper bed to replace mine with so i purchased one this morning that fits but does not have a rear fuel door, so my question is... can i simply remove the rear tank and only rely on the first tank to do the job and without major modifications?

gatekeeper6604@yahoo.de

 

The answer is yes but you'll want to plug the fuel lines. I have made plugs for these with a common stud-bolt used for fastening various engine parts, like accessories on the valve cover bolts. It's looks like a bolt with an extra stud portion sticking up from the head. Cut the threads off the end below the nut to leave the smooth shank part, and file down the sharp egdes. This is the portion that will plug into the fuel line. Then just replace the retaining clip that keeps the line attached at the tank. You may have to do a little extra grinding on the bolt head to allow room for the clip. I can't remember what size bolt works best, but i had some in box of fasteners from an engine swap I did, so it's a common Ford bolt size.

 

If you have to paint bed to match just weld a stock filler door in it (my body guy says $75.00 since have to paint anyway. . Done it many times. I don't know I drive my truck 500-600 miles a week at time as well as trips and I would miss the other tank and hat stoping the extra 2-3 time week. But good luck and keep us posted.

 

I removed my rear tank since it was full of sludge. Look for where the fuel line splits off from the front tank. It should be a small 3 port connector. You could cut it off there and install a fuel line repair kit , which would eliminate the rear lines or just plug the lines to the rear tank. I plugged the lines at first, but the pressure kept causing a leak where it was plugged.

 

I eliminated my rear and bought a new front...(opposite of your situation, i still have both filler doors, but one opens to the ground). what I did because I read that your 6 port selector valves are notorious for the filter clogging in the bottom, is I went to the ford dealer, and for like 40 bucks just got a 3 port selector for a single tank f150. that way you dont have any plugged lines to worry about, and its a good way not to worry about the filter clogging and leaving you stranded one day with a fuel problem. I believe the replacement selector valves dont come with a filter, becuase ford realized this was a flaw...

 

He does not have a selector valve, only the vans had selector valves in 1990.

 

well here is what the details are...

1990 Ford F-150 Lariat XLT = Needs the Bed
1982 Ford F-100 Standard Cab = Had the Good Bed

My Problem Finding the bed is this, i have the extended cab and a 144" Wheel Set with a 22" clearence from bed to fender and all of those trucks are either destroyed or non-existant here.

Yes i am going to paint it because i had to replace the truck floor so i cut my old truck floor out and beat it back into submission and then i am going to weld the bed floor on the f-150 to the bed on the f-100.

the f-100 did not come with dual tanks and mine does but also the back tank has sludge and a bad fuel pump. and as for the long trips, not a problem i am turning it into a street rod for my son who is 2.

if the 90' Fords had a selector, what would be the trouble in just cutting that out and using an inline fuel filter or a coupler to repair that line and turn it into a single line? i heard about the guy who had the fuel pressure drop, i have this odd problem, the rear tank has a bad pump so when i fuel up i use the front yeah duh. i drive 100 miles and i am out of gas, well i look and the back tank that was once empty is now full, and the other day when i took the back cap off about 10 gallons of gas shot out of that tank like the truck was vommiting like in the exorcist or something.

Gatekeeper6604@yahoo.de

 

Here are the diagrams of the F-series Gas 1986 - 1989 with a selector valve and the Gas F-series 1990 and newer fuel systems.

86-89 F with selector valve:
http://i54.photobucket.com/albums/g91/subford/Fuel/88Fuelsystem.gif

90 and newer without selector valve:
http://i54.photobucket.com/albums/g91/subford/Fuel/FielSystem.jpg

On the 1990 and newer Gas F series if a tank fills while on the other tank then the tank filling has bad valves (check or shuttle) in the fuel delivery module that is inside the tank.

On the 1986 - 1989 Gas F series if the a front tank fills while on the rear tank then you have a bad (stuck) fuel return valve in the selector valve for the front tank filling it. This does not to happen to the rear tank, as the "O" rings can not stick the other way.

You can not cutout something that is not there and it already has a fuel filter on the line going to the engine.

 

subford is right, i did not pay attention to your year. I remember reading that when i did mine, in 89 they went to the FDM....(fuel delivery module)