What is this relay for?

Mrcrowley · 11-06-2009, 02:45 PM

I am trying to figure out if this relay is the secondary tank fuel pump relay ?

leolkfrm · 11-06-2009, 02:47 PM

can't tell it's location

Mrcrowley · 11-06-2009, 03:06 PM

Quote:

Originally Posted by leolkfrm

can't tell it's location

It is under hood outside the Junction box not attached to anything .

1500cheyenne96 · 11-06-2009, 03:45 PM

start the truck up and switch to the secondary tank then try pulling the relay if it quits then thats a pretty good indication thats whats it for

Mrcrowley · 11-06-2009, 04:12 PM

Quote:

Originally Posted by 1500cheyenne96

start the truck up and switch to the secondary tank then try pulling the relay if it quits then thats a pretty good indication thats whats it for

No switch it is automatic. Fuel is not being fed from secondary tank tested wires no 12 volt on any wires from the plug. So assuming it is secondary tanks relay BUT can not find it on chassis traced wires all the ways back to junction boox under hood this relay is outside of the juction box .

1500cheyenne96 · 11-06-2009, 04:21 PM

Seems kind weird to me that they would but a tank relay outside the junction box but they've been known to do some pretty weird things just a curios question but does this truck have the plow prep package on it?

1500cheyenne96 · 11-06-2009, 04:38 PM

i Found this wiring diagram for 1 ton trucks hope it helps you

Mrcrowley · 11-06-2009, 04:49 PM

Yes it does have a fisher v plow plow on it controler computer sits on top of juction box under hood . but this looks like part of the truck not a add it is wrapped in tape and in plastic conduit. Just a little background info :
I have two tanks second tank is not pumping fuel I know this because it stays full. I am not sure if the pump turns on only when it is needed or if it is supposed to run all the time.

1500cheyenne96 · 11-06-2009, 04:55 PM

Ok well with that diagram it should be able to help but you could try to find out which wire is hot when key on the cut it and try hooking power directly in to it to see if the pump comes on at least that way you'll know if it's the pump a bad wire or sending unit.I think on those the pumps is only supposed to run when needed but i'm not 100% on that. Oh the plow prep package is a factory option install

leolkfrm · 11-06-2009, 05:36 PM

we have the bigger version of it at school and both tanks draw evenly
wonder if you have a problem with the return line

11-06-2009, 02:45 PM	#1
Mrcrowley Full Member Join Date: Oct 2009 Location: New Hampshire Posts: 61	What is this relay for? I am trying to figure out if this relay is the secondary tank fuel pump relay ? Attached Thumbnails __________________ 2001 Chevy Silverado K3500 8.1 litre 1 ton dually Dump Allison tranny 56430 mileage 2004 Nissan Titan LE crew cab 5.6 litre B/T package

11-06-2009, 02:47 PM	#2
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,298	can't tell it's location __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

11-06-2009, 04:38 PM	#7
1500cheyenne96 Senior Member Join Date: Sep 2009 Location: MIchigan Posts: 195	i Found this wiring diagram for 1 ton trucks hope it helps you Attached Thumbnails

11-06-2009, 04:49 PM	#8
Mrcrowley Full Member Join Date: Oct 2009 Location: New Hampshire Posts: 61	Yes it does have a fisher v plow plow on it controler computer sits on top of juction box under hood . but this looks like part of the truck not a add it is wrapped in tape and in plastic conduit. Just a little background info : I have two tanks second tank is not pumping fuel I know this because it stays full. I am not sure if the pump turns on only when it is needed or if it is supposed to run all the time. __________________ 2001 Chevy Silverado K3500 8.1 litre 1 ton dually Dump Allison tranny 56430 mileage 2004 Nissan Titan LE crew cab 5.6 litre B/T package

11-06-2009, 05:36 PM	#10
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,298	we have the bigger version of it at school and both tanks draw evenly wonder if you have a problem with the return line __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

11-06-2009, 03:45 PM	#4
1500cheyenne96 Senior Member Join Date: Sep 2009 Location: MIchigan Posts: 195	start the truck up and switch to the secondary tank then try pulling the relay if it quits then thats a pretty good indication thats whats it for

11-06-2009, 04:21 PM	#6
1500cheyenne96 Senior Member Join Date: Sep 2009 Location: MIchigan Posts: 195	Seems kind weird to me that they would but a tank relay outside the junction box but they've been known to do some pretty weird things just a curios question but does this truck have the plow prep package on it?

11-06-2009, 04:55 PM	#9
1500cheyenne96 Senior Member Join Date: Sep 2009 Location: MIchigan Posts: 195	Ok well with that diagram it should be able to help but you could try to find out which wire is hot when key on the cut it and try hooking power directly in to it to see if the pump comes on at least that way you'll know if it's the pump a bad wire or sending unit.I think on those the pumps is only supposed to run when needed but i'm not 100% on that. Oh the plow prep package is a factory option install

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