fuel tanks
fuel tanks
More Turbo
Joined: Jul 2003
Posts: 566
Likes: 5
From: SC
I don't quite get your question, but I'll guess.
The tanks are separate. There's a switch on the dash to switch the guage to read one or the other. This switch also switches on and off the fuel pumps.
Therefore is you want to use, say, the front tank, turn the switch to the front one and only put gas in the front tank. Ignore the rear one.
It can be that when you fill up one tank that fuel will migrate over to the other one. This is a malfunction and there have been several posts about this happening and how to fix the problem.
The tanks are separate. There's a switch on the dash to switch the guage to read one or the other. This switch also switches on and off the fuel pumps.
Therefore is you want to use, say, the front tank, turn the switch to the front one and only put gas in the front tank. Ignore the rear one.
It can be that when you fill up one tank that fuel will migrate over to the other one. This is a malfunction and there have been several posts about this happening and how to fix the problem.
Fleet Mechanic
Joined: Jul 2004
Posts: 1,552
Likes: 0
From: va
If thats whats happening the fuel selector valve is bad. Go to the SEARCH option at the top of this page and type in selector valve then go down to Dual fuel tankS by mike L 8-8-2004. If you cant find it write back. Replacement part at Ford for 56.00 ask for net price, call more then one dealer they quote different prices. Very hard to find after market part that's a direct applacation fit. Hope this helps.
Thread Starter
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Junior User
Joined: Jun 2004
Posts: 68
Likes: 0
From: mi
Originally Posted by GypsyR
I don't quite get your question, but I'll guess.
The tanks are separate. There's a switch on the dash to switch the guage to read one or the other. This switch also switches on and off the fuel pumps.
Therefore is you want to use, say, the front tank, turn the switch to the front one and only put gas in the front tank. Ignore the rear one.
It can be that when you fill up one tank that fuel will migrate over to the other one. This is a malfunction and there have been several posts about this happening and how to fix the problem.
The tanks are separate. There's a switch on the dash to switch the guage to read one or the other. This switch also switches on and off the fuel pumps.
Therefore is you want to use, say, the front tank, turn the switch to the front one and only put gas in the front tank. Ignore the rear one.
It can be that when you fill up one tank that fuel will migrate over to the other one. This is a malfunction and there have been several posts about this happening and how to fix the problem.
Senior User
Joined: Jan 2004
Posts: 279
Likes: 0
From: Kansas City, MO
I'm not sure why you would want to, it's not like these trucks get 30 yet alone 20 MPG. Just to warn you, your going to be a very frequent customer at your local gas station if you carry this one out.
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Fleet Mechanic
Joined: Jul 2004
Posts: 1,552
Likes: 0
From: va
I have an 1987 f150 with 4.9 runs reg. gas, 140,000. I blocked off the two top ports at the fuel tank selector valve. The two top ports are for the front tank. The drivers side is the 5/16" fuel supply port and the pass. side is the 3/8" return port. Get two pieces of 2" inch fuel lines one 5/16" and one 3/8"and 4 hose clamps and two bolts that fit in each hose. Don't forget to run the front tank low before removing, it heavy. Also unplug the fuel pump inertia switch located on the firewall left of the brake pedal and run until it stalls it relieve the fuel pressure.
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Junior User
Joined: Jun 2004
Posts: 68
Likes: 0
From: mi
Originally Posted by Andyman8282
I'm not sure why you would want to, it's not like these trucks get 30 yet alone 20 MPG. Just to warn you, your going to be a very frequent customer at your local gas station if you carry this one out.
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Junior User
Joined: Jun 2004
Posts: 68
Likes: 0
From: mi
Originally Posted by mike L
I have an 1987 f150 with 4.9 runs reg. gas, 140,000. I blocked off the two top ports at the fuel tank selector valve. The two top ports are for the front tank. The drivers side is the 5/16" fuel supply port and the pass. side is the 3/8" return port. Get two pieces of 2" inch fuel lines one 5/16" and one 3/8"and 4 hose clamps and two bolts that fit in each hose. Don't forget to run the front tank low before removing, it heavy. Also unplug the fuel pump inertia switch located on the firewall left of the brake pedal and run until it stalls it relieve the fuel pressure.
New User
Joined: Oct 2017
Posts: 21
Likes: 1
From: Bentonia, Mississippi
Now, hope someone can also help me find the location(s?) of the fuel tank selector valve AND the high pressure pump!!
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https://www.ford-trucks.com/forums/1579544-trusty-88-f150-4-9-liter-wont-start.html#post18598009
Tuned
Joined: Jan 2018
Posts: 414
Likes: 42
From: State of Confusion
Driver's side frame rail. Follow the lines forward from the tanks and you'll find a black plastic can with four connections on one side and two on the other, that's the selector valve. Follow the two lines forward and one of them goes into the high pressure pump.
Fleet Mechanic
Joined: Jul 2004
Posts: 1,552
Likes: 0
From: va
Hotshot
Joined: Nov 2008
Posts: 15,014
Likes: 35
From: Semper Fi tell I die!
these trucks have the stupidist tank design in the world, 2 electric pumps then anther high pressure pump on frame rail, at least my 75 just had one pump on the engine for all 4 tanks, and was simple and reliable. this efi garbage must have been a huge embarassment to ford from these years either that or they just wanted to sell even more parts per truck.