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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Diesel Engine Discussion => Topic started by: snibook7537 on February 24, 2012, 12:26:04 pm
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Hello,
I was just wondering if the tank switch in the cab that switches left to right is it's own unique switch for Diesels or it is the same as the carb or the same as the TBI? I know the Carb and TBI are different, and at the junkyard there is a TBI truck with a switch and I'm just wondering if I should grab one as a spare for my diesel.
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On my '87 TBI its a 4 pin ... i just replaced it a little while ago because the plactic throw was wearing out and not fully engaging the switch. The easiest way to see if they are the same is to pull the in your truck and see how many poles are on the switch. I however wouldn'r reccomend getting a junkyard switch for the selector becasue as i said earlier it's all plastic. the actual switch, where you press it up or down, just has a ban me shaped piece of plastic that moves the actual terminal. It will wear out... I found that an early sign of it weraing out was having to hold the key over a little longer as well as it eventually not allowing me to use the right tank. The switch works rather simply. when it is in the down position it energiges the selector valve and shifts to the left tank. When in the up position it is de-energized and opens to the right tank. I know this is how it works on the TBI and so as chevy likes to keep it simple it should be tha same on diesel as well.