Help! canister purge valve solenoid

[kwlong]

I have a 1989 Corvette that when it gets hot it "vapor locks". It runs rough and will not restart until I remove the gas cap.
I have replaced the gas cap, canister and purge valve. I am looking to replace the soelnoid GM# 1997181 Delco # 214-375.
I cannot find this part anywhere. The dealer says it is discontinued.
Any ideas?
Thanks

 

[vetteoz]

when it gets hot it "vapor locks". It runs rough and will not restart until I remove the gas cap.

Technically it can't vapor lock because as soon as pump runs it forces hot fuel / vapor back to the tank giving cool fuel at injectors
Which way does air flow when you remove the cap; in or out of tank?

 

[kwlong]

It seems to suck in.

 

[vetteoz]

It seems to suck in.

That would indicate a faulty cap not allowing outside air in to replace fuel used up but you say you have replaced that.
Can you suck through cap? ( from outside to inside )

 

[kwlong]

canister purge solenoid

It is a locking gas cap. If I blow on the inside it does not seem to vent.
This is a new gas cap. I guess I could have gotten a bad one.

 

[kwlong]

caister solenoid

Do you know if this should be a vented gas cap or non-venting?
They just informed me that there where different ones. They never asked me before.

 

[TedC]

Just checked my gas cap on my 1989. It is vented.

Here is a locking gas cap for 75-96 vettes.

"Properly Sealed and Vented To Comply With Emission & Engine Requirements"
C4 C3 Corvette Gas Caps 1975-1996 Locking - Mid America Motorworks

 

[vetteoz]

Do you know if this should be a vented gas cap or non-venting?
.

"Non vented"
Allows air but not out .
Fumes in tank are routed to engine through purge canister.
Vented cap allows fumes to escape to atmosphere; greenie's not happy.:ugh

 

[TedC]

I agree with vetteoz on the operation of this cap.

By vented, this gas cap allows air to flow in one direction once a specified pressure is reached. It does not allow air to escape, even under pressure. It is not an open vent that air can enter and escape.

 

[kwlong]

canister solenoid

Thanks for your help. I just ordered a new cap from Mid America.

 

[vetteoz]

Thanks for your help. I just ordered a new cap from Mid America.

In any case , unless the cap was faulty ; neither style would cause a vacuum buildup in the tank as you suspect is happening

 

[boomdriver]

"Non vented"
Allows air but not out .
Fumes in tank are routed to engine through purge canister.
Vented cap allows fumes to escape to atmosphere; greenie's not happy.:ugh

yep...
I've failed emissions test over a gas cap that leaked. Most test have an adpator with pump to test the caps ability to seal and its check valve operation.