Gas Tank

RI749 · Post by **RI749** » Wed Jul 12, 2006 7:19 pm

Will a 1984 and a 1986 gas tank fit a 1985 Spree?

-aL- · Post by **-aL-** » Wed Jul 12, 2006 7:27 pm

not at the same time... haha...jk... i dunno

berreta22 · Post by **berreta22** » Wed Jul 12, 2006 7:40 pm

yes and no. The tank is a direct bolt up but if i remember correctly the wiring is different. Noiseguy had figured out the wiring which is in the docs somewhere. i found it here: You guys know that the Spree service manual's in tech docs, right? It has the wiring diagram.

Anyway, I looked over the diagrams. There's a change in 85->86 on the way the tanks connect. I would first try to reuse the original sender in the replacement tank, or get a replacement tank that's the right year.

The following is "try at you own risk." I am guessing that this will work based on the diagrams. If it does work, I'd like to know so that I can move this to tech docs. Basically, you ground the Bu/W wire in both cases.

Also, remove the sender from the tank until we know this works. I'm concerned on the '86 sender that the full 12V across the sender might burn it up. Catastrophic results if it's in a full tank of fuel.

For the 84/85 wiring harness to '86 fuel tank:
Connect tank Y/W to harness Y/W
Connect tank Bu/W to harness G
Connect tank G to harness G

For the 86 wiring harness to 84/85 fuel tank:
Connect tank Y/W to harness Y/W
Connect harness Bu/W to harness G
Connect tank G to harness G

Let me know if this works. There's a chance that the '86 gauge cluster is wired differently internally, so that this won't work. In that case it may toast your '86 fuel gauge if you leave it hooked up. Best to just tap the Bu/W wire to ground and see if the gauge responds appropriately, or buries itself to one side or the other. If it buries, disconnect it, it didn't work. I don't see this happening on the 84/85 gauge, it's meant to see 12V across one side. Then later on this is the correction:Kenny_McCormic wrote:
it works but it reads backwards (full is emty and emty is full)

OK, try this then:
Connect tank Y/W to harness Bu/W
Connect harness Y/W to harness G
Connect tank G to harness G

The sender is a black box, I'm having to guess how it's wired.

berreta22 · Post by **berreta22** » Wed Jul 12, 2006 7:50 pm

remember. noiseguy figured this all out..not me..all this is in the tech docs. Try searching around. I thought id just be nice and put it all here to save you trouble looking for it.

myhonda · Post by **myhonda** » Wed Jul 12, 2006 9:53 pm

i had 2 tanks on my ped at once. and the gas gage worked on both of em