Gas tank vent?

[stevedmc]

Where do you run it? The front crumple tube? What gauge wire?

I ran a ground wire directly from the battery to the fuel pump. I don't recommend doing this because it bypasses the inertia switch. I did this temporary fix because I was in a bind and needed to make sure my fuel pump didn't have any ground problems for the 10+ hour trip to Sean's house a few months back.

I'm not sure what gauge the wire is. It is just some spare wire I had laying around from when I rewired 12v to my radio. I wouldn't recommend doing what I did, since my ground connection is for testing purposes only. When I get around to it I'm going to remove it and install a full ground bus similar to what Captain Carburetor has done.

As I've said over and over, don't do what I did. I'm not married, don't have a girlfriend, no kids, and frankly, I don't value my life. If my parents weren't alive to worry about me, I would own a motorcycle.

[EdR5150]

I don't recommend doing this because it bypasses the inertia switch.

I thought the hot wire would run through it... does the ground really run through the inertia switch?

[sean]

does the ground really run through the inertia switch?

Yes. Schematics can be seen here:
http://dmctalk.org/showthread.php?40...ing-Schematics

[Bitsyncmaster]

I thought the hot wire would run through it... does the ground really run through the inertia switch?

Yes all the pump current goes throught the switch. It should have been wired to the RPM relay so no current would pass throught the switch.

[DMC3165]

Just to follow up on this quick. If there is a problem with the charcoal canister, would that kick on the Lambda light? Not really sure about a car from this vintage but other cars with emission controls would usually trip a check engine light if something like that happens.

[dustybarn]

Just to follow up on this quick. If there is a problem with the charcoal canister, would that kick on the Lambda light? Not really sure about a car from this vintage but other cars with emission controls would usually trip a check engine light if something like that happens.

No. Cars in 1981 had nowhere near as sophisticated onboard diagnostics as cars do now. The Lambda light comes on when the Lambda counter counts enough miles. The oxygen sensors of the time had poor durability and the only way to make the cars pass emissions standards was to enforce replacement of the oxygen sensor every so often. Chevrolets of the same time period had a mechanical red flag that would drop down in the odometer window to tell you to replace the oxygen sensor. AFAIK on the D there is no direct diagnostic capability with respect to the evaporative emissions system.

[DMC3165]

I've still been having periodic trouble with this. But I noticed today after an hour drive my gas cap had alot of pressure under it. When I pulled it off and restarted the car I could see gas vapors bellowing out the gas fill.


I checked my canister and all the lines are clear the inside of the canister seems ok no obvious obstructions anywhere. I did notice the small line to the left of the canister was difficult to blow into. But I still don't think this is my problem.

Gas smell at times is horrible. Comes right in where the shifter boot is. Hopefully I won't blow myself up one day with this thing.

[David T]

I would check the vent hose that runs from the gas tank to the cannister to make sure it is hooked up, not blocked off or kinked.
David Teitelbaum

[DMC3165]

What is the roll over valve for and is it a check valve?

[Ron]

What is the roll over valve for and is it a check valve?

See page 85:
http://dl.dropbox.com/u/13720563/DeL...cal-Hybrid.pdf