Rear tank works, I think - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 10-22-2010, 11:24 AM Thread Starter
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Rear tank works, I think

So in spite of the fact that the previous owner assured me that the rear tank worked, I decided to test it out for myself. Filled up front tank, thought I'd put a few gallons in the rear tank just for good measure. At about two gallons on the rear the pump shut off. Tried a few more times for good measure, definitely being shut off. Couldn't see any fuel in the filler neck, so just decided maybe the tank was already full.

Started truck, switched to rear tank. Kept right on purring. Well, clacking. But the gas gauge never rose above 1/4 tank. Wasn't sure if this was a problem with the tank or the gauge so left it on the rear tank and drove. A few days later the gauge was off the scale and no longer visible. Finally started getting some hesitation in the motor, switched back to the main tank and checked mileage. Looks like I drove about 100 miles on the rear tank.

So I think I need to have someone check the rear tank. Float needs adjusting or replacing, tank may need cleaning.......whaddya think?

1996 F350 XLT 4X4 CCLB

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post #2 of 2 Old 10-22-2010, 01:01 PM
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Common problem on the OBS. My rear tank is a PITA to fill unless I drive the rear wheel up on a 6" block. There's a fix that can be found somewhere on this site. Vent modification or something. You might try a search to find it.

Randy DuCharme (Radio AD5GB)

'06 F-250 FX4 A/T Super Cab short bed /w tow pkg
SCT SF3 tuner /w Gearhead Performance custom tunes. ARP head studs, EGR delete, oil cooler/drainback tube/STC coupler/blue spring/standpipe & dummy plug upgrades, ScanGauge II, Sinister diesel coolant filter, Fumoto drain valves, Stage II direct clutch and ECP solenoids.
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