TOPIC: EVAP or Canister Purge Solenoid on GM Motors

Gentlemen,

I discovered what the Solenoid just past the TB is on my 5.3 & 4.8 (Also 6.0, it is the Canister Purge Solenoid. It allows gases(vapors) from the fuel tank to be `purged into the intake periodically.



I`m conflicted about this. On one hand it is allowing a vacuum leak but on the other it is providing gas vapor. It seems to me this is a good thing.

Am I right...

Yo, Tim..

Think you're right on both counts. Here's what I'd try:

Cleanly cut the plastic feed tube from the charcoal canister so it could be easily spliced back together if needed. Cap off solonoid end, run other end into air intake duct like the PCV re-route we did, with it's own tap to air duct. But first, I would hook a vacuum guage up to manifold vac, see where idle man. vac is. That way get before/after.

I'd also search for any other man. vac. taps on intake, check 'em out, might try temp. capping vac. to HVAC dash controls, see if any difference.

If cap/re-route of EVAP solonoid causes check engine light, try re-connecting back to cut line at solonoid,w/ a tee. Add an inline restriction to solonoid feed, like one of these:










so this way, gasoline fumes from charcoal canister feed to main air duct, but some can go to soloniod too. Only need tee/ restriction valve (dyslexic, can't remember what this is called! ) IF there's a Check engine light/code for EVAP ststem. If needed, I'd try this, by opening the valve a bit at a time 'till code goes away. AND- if the EVAP re-route throws a code, but it Runs Better, maybe just leave it re-routed w/O the Tee/valve, and just put back stock for that Occasional Need...(get it?)

"Kay, that's what I can come up with for now, Yer' Doin' GREAT, Tim--We will get this Suburban over the Hump!

Tracy G

OK I'll try uploading the pic later, it's just a small brass block w/ an adjustable needle valve and hose nipples on each end, a metal version of an aquarium valve Tracy G

OK- just thinking out loud here... is there a way to purposely make gas vapor from the current system feeding into the intake? What would it take to make a vaporizer?

Any thoughts out there?

Gettin' into the deeper end of the pool...

Dan Merrick knows about this. Thermal Catalytic Cracking of crankcase gases is what you reference, Tim.

HIMAC Research, Bruce McBurney, Google that. MPG Mike has or is connected with a gizmo made to do this, forget the name, but it's purpose-made for this $$$ I think.

Other thread I just posted to about EGR stuff w/ your pic of Silverado (so THAT is what that port capped on the SUB. is for!). I'm rattling on about wondering how to make a Catalytic Cracker for the Crankcase Crud. I got it a Crud Cracker!

Just was talking to my neighbor Heat Sink Jake and his buddies about what/where to look for materials to make a Crud Cracker. Sounds like it will require welding/actual fabricating.

But I'd be thrilled if someone else can contribute RE: this idea. Heck, I already Named it.

Tracy G

I just jumped your thread, sorry, Tim! Were you talking of doing something w/ the EVAP system fuel vapors, that's already gasoline vapor.

Too excited here my Mistifyer just showed up!

Tracy G