Fuel system problem
Senior User
Joined: May 2012
Posts: 315
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Sorry to highjack the thread, and this might be a dumb question but that's never stopped me before. I installed a tank under the rear bed of my truck. The truck's a '66 but the engine is a 1975 (6-300). Am I correct, based on this quote, that my sending unit and my fuel line should be 3/8" inside diameter?
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,251
Likes: 5,815
From: S/W Missouri, Polk county
Here ia a little blur about fuel tanks.....There are two differences between the tanks. Tanks with EEC have a hole in the top center of the tank. A rubber grommet and check valve are pressed into the hole. A line goes from the check valve along the inside of the passenger side frame rail to the engine compartment where it hooks up to a charcoal canister. Non-EEC tanks don't have this hole. The other difference is the nipple for the breather line that is located right next to the nipple for the filler hose is located 180 degrees opposite.
If you are going from an EEC tank to a non-EEC tank you must also change the fuel cap to a vented style. The EEC tanks are vented through the EEC system and use a sealed fuel cap. Non-EEC tanks vent through the fuel filler cap.
If you run a non-EEC tank and a sealed cap the minimum is you'll have fuel starvation problems, at worst a collapsed fuel tank.
- Is your truck a longbed 4WD? Does it have evaporative emission system?
There are two possibilities with the plastic tank.
79 F150-350 regular cab, 133" WB 4WD, w/ evap. emissions system, 24.8 gallon mid-ship plastic tank
D7TZ-9002-C
Same w/o evaporative emissions system 26.3 gallon plastic tank
D7TZ-9002-D
If you are going from an EEC tank to a non-EEC tank you must also change the fuel cap to a vented style. The EEC tanks are vented through the EEC system and use a sealed fuel cap. Non-EEC tanks vent through the fuel filler cap.
If you run a non-EEC tank and a sealed cap the minimum is you'll have fuel starvation problems, at worst a collapsed fuel tank.
- Is your truck a longbed 4WD? Does it have evaporative emission system?
There are two possibilities with the plastic tank.
79 F150-350 regular cab, 133" WB 4WD, w/ evap. emissions system, 24.8 gallon mid-ship plastic tank
D7TZ-9002-C
Same w/o evaporative emissions system 26.3 gallon plastic tank
D7TZ-9002-D
Postmaster
Joined: Nov 2011
Posts: 2,553
Likes: 10
As a general comment, the clear type filters seldom look "full". Appearance of the filter does not tell much. To all the good advice above, I'll just add old rubber lines and gunked up tanks/pickups have "got" me before.
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