Three Fuel Tanks?
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Senior User
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From: Upland CA
Three Fuel Tanks?
The '74 4x4 P/U I bought a few months back is missing the middle of its three fuel tanks, and the selection valve on the floor inside the truck. I'd like to have all three tanks available. I've searched but not found anything that explains how the system works or, more importantly, how to go about getting it working the way it was designed to work.
I'd really appreciate any advice!
Vic
I'd really appreciate any advice!
Vic
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Ford did not install 3 fuel tanks. There's either an in-cab (except Super & Crew Cabs) and aft axle tank. The in-cab tank was cancelled after 1977.
Or a mid-ship and aft axle tank, one of which was an option. The factory valve installed on the floor (1973/74) is only designed to work with 2.
But aftermarket companies also installed auxiliary fuel tanks, the caps are usually behind doors that were riveted to the bed sides.
Factory installed: 1973/76's have exposed fuel caps, 1977/79's have fuel doors.
Or a mid-ship and aft axle tank, one of which was an option. The factory valve installed on the floor (1973/74) is only designed to work with 2.
But aftermarket companies also installed auxiliary fuel tanks, the caps are usually behind doors that were riveted to the bed sides.
Factory installed: 1973/76's have exposed fuel caps, 1977/79's have fuel doors.
Thread Starter
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Senior User
Joined: Nov 2015
Posts: 163
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From: Upland CA
Ford did not install 3 fuel tanks. There's either an in-cab (except Super & Crew Cabs) and aft axle tank. The in-cab tank was cancelled after 1977.
Or a mid-ship and aft axle tank, one of which was an option. The factory valve installed on the floor (1973/74) is only designed to work with 2.
But aftermarket companies also installed auxiliary fuel tanks, the caps are usually behind doors that were riveted to the bed sides.
Factory installed: 1973/76's have exposed fuel caps, 1977/79's have fuel doors.
Or a mid-ship and aft axle tank, one of which was an option. The factory valve installed on the floor (1973/74) is only designed to work with 2.
But aftermarket companies also installed auxiliary fuel tanks, the caps are usually behind doors that were riveted to the bed sides.
Factory installed: 1973/76's have exposed fuel caps, 1977/79's have fuel doors.
My truck has the in-cab and aft axle tanks, but there is a fuel door for a middle tank that looks totally factory made; no riveting.
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Senior User
Joined: Nov 2015
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From: Upland CA
Now, has anyone ever plumbed and wired up a system to get three tanks working? With a 429 in this truck I'm thinking a third tank may come in handy, especially for the long trips we take in the west for hunting, that would be my reason, camping (see reason #1), and fishing.
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Note applications in parts catalog pic below for 1977/ (1977/79) F100/350 Styleside (body style 99) 27840-1 left quarter panels (bedsides).
Lead Driver
Joined: Mar 2010
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From: West Virginia
OK, that stops my head scratchin'.
Now, has anyone ever plumbed and wired up a system to get three tanks working? With a 429 in this truck I'm thinking a third tank may come in handy, especially for the long trips we take in the west for hunting, that would be my reason, camping (see reason #1), and fishing.
Now, has anyone ever plumbed and wired up a system to get three tanks working? With a 429 in this truck I'm thinking a third tank may come in handy, especially for the long trips we take in the west for hunting, that would be my reason, camping (see reason #1), and fishing.
I've seen pictures of floor valves and I think they were manual valves.
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Postmaster
Joined: Nov 2011
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Personally I would be happy to "loose" the in cab tank. I am not crazy about driving around with gas behind the seat. The rear tank and side tank would give decent range and also work with adapted factory type valves for 2 tanks.
Not sure on frame width on your '74... if it has the wider frame it could take the 38 gallon rear tank. Good range by itself and really good with a mid-ship tank added.
Not sure on frame width on your '74... if it has the wider frame it could take the 38 gallon rear tank. Good range by itself and really good with a mid-ship tank added.
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Ford Parts Specialist
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From: Simi Valley, CA
33 1/2" width between the inner frame rails behind the cab:
1961/72 F100/350 / 1973/77 F250 4WD (High Boys) / 1973/79: F350 Regular Cabs on the 140" wheelbase & F350 Cab & Chassis.
1961/72 F100/350 / 1973/77 F250 4WD (High Boys) / 1973/79: F350 Regular Cabs on the 140" wheelbase & F350 Cab & Chassis.
Elder User
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From: south east kansas
this may not help... but my 72 when i got it had 3 tanks on/in it ( 1 in-cab and 1 in front of each rear wheel), the way they had them set up was they all ran to manual selector switch, no sending units on either of the back two( guess they just ran the back two empty than switched to the other). like i said it may not help but that's how it was on my 72.
Laughing Gas
Joined: Jun 2016
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From: Des Moines, Washington
My '74 F250 Super Cab has three tanks.
The for and aft factory tanks with exposed caps and a third tank outboard of the frame rails on the passenger side. It's filled through a locking door screwed onto the side of the box.
The factory manual selector valve was replaced with a three input valve, it's currently frozen and the saddle tank has 5+ year old gas in it. I'm stuck using the aux or forward tank but then again, I only drive 5000 miles a decade so it's not so bad.
Any tricks for fueling the thing without spilling on my shoes? I hate when that happens.
The for and aft factory tanks with exposed caps and a third tank outboard of the frame rails on the passenger side. It's filled through a locking door screwed onto the side of the box.
The factory manual selector valve was replaced with a three input valve, it's currently frozen and the saddle tank has 5+ year old gas in it. I'm stuck using the aux or forward tank but then again, I only drive 5000 miles a decade so it's not so bad.
Any tricks for fueling the thing without spilling on my shoes? I hate when that happens.
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