Dual tank switch blowing fuse

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Tanaga

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1984
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K30
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6.2 diesel
I have a 1990 V3500 crew cab with dual tanks. Every time I switch tanks the fuel blows. Once the fuse blows I have no fuel gauge. Any one else have this problem? Any tips of how to fix this?

Thanks
 

bucket

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Unplug the connector from the switching valve and then operate the switch, with the ignition on of course. If the fuse still blows, it's a wiring issue. If the fuse does not blow, it's likely a shorted switching valve.
 

Tanaga

Junior Member
Joined
Feb 21, 2017
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6
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Location
Palmer, AK
First Name
Dave
Truck Year
1984
Truck Model
K30
Engine Size
6.2 diesel
Unplug the connector from the switching valve and then operate the switch, with the ignition on of course. If the fuse still blows, it's a wiring issue. If the fuse does not blow, it's likely a shorted switching valve.

Thanks I’ll try that and report back.
 

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