What do I do with my Evap System?

[Rick1991]

Now that I'm engine swapping my truck I'm wondering what to do with my evap system? Id like to just take it out but heard you need something to vent pressure.

 

[90W7]

I would Imagine you can just use the existing evap line and that be your vent to atmosphere and then either block off the purge solenoid or leave it in as long as it's normally closed when unplugged.

 

[Rick1991]

I would Imagine you can just use the existing evap line and that be your vent to atmosphere and then either block off the purge solenoid or leave it in as long as it's normally closed when unplugged.

That's kind of what I thought, I think there are two lines coming of the tank (I believe)? because those alone will let pressure in our out. Where is the purge solenoid?

 

[90W7]

Generally you will have a purge solenoid on the intake manifold to let tank vapor into the intake and then you have a vent solenoid at the tank that opens to draw air in.

Now you only have to worry about the purge solenoid I believe.. I'm trying to recall on my 91 tbi truck/the emissions diagram.. I thought mine was pretty much a open system with the charcoal canister.

==PURGE SOLENOID ==

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[hybrid1]

My truck is just vented into the atmosphere and the purge solenoid on the engine is deactivated in the tune. No issues


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[Rick1991]

My truck is just vented into the atmosphere and the purge solenoid on the engine is deactivated in the tune. No issues


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So basically I can cut the line at/around the gas tank and be fine?

 

[hybrid1]

Should, I just have mine disconnected where the charcoal canister was located. I plan on cutting it back passed the firewall eventually


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[Rick1991]

Alright I'll do the same. Annoying little system they have ha.

 

[Rick1991]

Also since I have some fellow swappers here maybe ill throw some more questions at you.

- How does my power get to my truck and all the interior accessories, Is there a power cord?

- My wipers tie into my engine harness does anyone know where the specific colors lead to so I can rewire them?

- I have a little box attached to make brake booster that was also attached to the engine harness wiring via two plugs, one to the black box and the other to what looks like a proportioning valve. I think its my ABS but I'm not totally sure. I also don't need it if it is. Pic:

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[SkyHighColorado]

google rwal removal/delete and you should find info on removing the RWAL (Rear wheel anti lock) easy to do just go to a hardware store.