selector valve.

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Apr 26, 2011 | 09:49 PM

ChristopherN

Thread Starter

Elder User

Joined: Jun 2010

Posts: 568

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From: Northern IL

selector valve.

Alright, it's been 3 months and I'm already fed up with dealing with the puny single side tank on my dual tank truck.

The rear tank fills the front so I just use the front and the back is totally empty right now.

So, I've seen selector valves at rock auto and stuff which I'd like to get but I have no stinking idea where this valve is in relation to the tanks. I *think* I found it but it looks like a female dog to get to. It's in between the tanks along frame rail? I followed the fuel lines and they all end up at that device. Unless that device is the dual reservoir? Does anybody have pictures or schematic diagram under these trucks?

Apr 26, 2011 | 10:51 PM

rla2005

Fleet Owner

Joined: Oct 2005

Posts: 20,786

Likes: 1,751

From: Kentucky

Dual Function Reservoir

Apr 27, 2011 | 04:58 AM

EPNCSU2006

Lead Driver

Joined: Nov 2002

Posts: 9,557

Likes: 44

From: Concord, NC

An external selector valve was not used after about 1989. The switching is done with a shuttle valve in the fuel delivery module inside each tank. Since the fuel is going into the front tank from the rear, you will need to replace the front tank FDM to correct the cross-flow issue.