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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Pulling fuel from both tanks?

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Old Nov 8, 2025 | 07:45 PM
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Pulling fuel from both tanks?

On my home today, started out will both tanks full, I always start drawing from the rear tank after filling both. When the fuel gauge shows 1/4, I flip to the front tank. Well, today as I was motoring along, glancing at gauges, I noticed the fuel gauge was not moving towards ‘E’ at the ‘normal rate’. Figured o crap, the sending unit is dying. 30 miles past the usual area when I switch tanks, I figured I better switch, so I did, and low and behold, the gauge started dropping like a rock(on a full tank), I know I started out with both tanks full. Is it possible the solenoid was allowing fuel to be pulled from both tanks? Apparently, fuel was being drawn from the front(smaller) tank at the same time my toggle switch was flipped for the rear(larger) tank.
 
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Old Nov 8, 2025 | 07:56 PM
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What vehicle are you driving?
 

Last edited by My4Fordtrucks; Nov 8, 2025 at 08:42 PM.
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Old Nov 8, 2025 | 08:39 PM
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1991 F-350 w/7.3L IDI
 
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Old Nov 8, 2025 | 08:41 PM
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I’m not familiar with the diesel fuel system. Hopefully someone that knows will chime in shortly.
 
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Old Nov 9, 2025 | 09:57 AM
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Your crossover valve is stuck in the middle if you are truly drawing fuel from both tanks
Ford diesels have a pretty simple crossover valve like the Chevs ran forever
They stick
 
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