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So I have an '89 GW I am working on that has the AMC360 engine. Most of the emissions hoses seem to have been cut and plugged by PO, however yesterday while trying to figure out what emissions systems I need to should keep, I manage to break a sensor that has an electrical harness connection on it. But I am not sure what part it is (see photo). It was located in line, down stream of the carb canister on the carb bowl vent line, after what I believe is the vapor separator (rusty looking metal thing in photo). Any help as to what this is and if it is needed? I am exempt from emission inspection, so deleting much of the emission stuff is just fine with me. Thanks.
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Last edited by MReno on Tue Feb 25, 2020 4:32 pm, edited 2 times in total.
1989 Jeep Grand Wagoneer
Newbee to owing an old classic that needs some work, but she runs!
You’re right, it is carb bowl vent solenoid. It is open when engine is off and supposed to be closed when ignition is on. It’s function is to vent gas fumes from bowl to charcoal canister to prevent excessive pressure in carb.
If you’re exempt from emissions testing and you don’t mind smell of gas from under the hood - you can get rid of it. I wouldn’t advice plugging that vent on the carb because without it there’s a chance of pressure building up in bowl and eventually flooding the engine
Sometimes we reinvent the wheel not to have more wheels but to have more inventors
1988 Grand Wagoneer - AMC 360 with ProFlo4 MPFI, TF727, NP229 FOR SALE 2021 JLU Willys EcoDiesel - new shiny toy
As I understand it - When the engine is running, the bowl is vented through the pair of bowl vents on the air horn. Engine off, the door in the air cleaner snorkel closes, shutting the air horn from the atmosphere, and the bowl needs another vent. Hence the solenoid valve. May be covered in the TSM ... no time to search right now.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.
Yeah, tgreese is right. And you should keep some way of venting the bowl for engine on and off both to prevent excessive pressure in the bowl
What I meant is that if you remove the solenoid and plug it’s vent, you need to have the air cleaner door open on engine off to still provide bowl ventilation. One downside is that it’s going to vent to atmosphere instead of charcoal canister, hence gas smell under the hood
Sometimes we reinvent the wheel not to have more wheels but to have more inventors
1988 Grand Wagoneer - AMC 360 with ProFlo4 MPFI, TF727, NP229 FOR SALE 2021 JLU Willys EcoDiesel - new shiny toy
You can delete the solenoid plumbing if you provide a vent for the float bowl when the engine is off. Possible you could prop open the snorkel door and vent the bowl that way. Clearly that would not be emissions compliant, but it would be fine for operation as long as the bowl does not dry out.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.
So I plan on replacing the carb vent bowl solenoid however with much of my emission stuff removed, I am unsure where on the carburetor I should have this attached? I have an Edlebrock 1405 carb, and are currently using the PCV port for PCV, the manifold vacuum port for the distributor, and the rear brake port for my power break booster line. The only port left would be on the front, lower left that is to be used for timed vacuum, which I have capped. Any suggestions on where to connect the carb bowl vent line?
1989 Jeep Grand Wagoneer
Newbee to owing an old classic that needs some work, but she runs!
You probably have an open element air cleaner. This type of air cleaner vents the float bowl directly to the atmosphere all the time, engine running or not. Even if you could connect the vent solenoid to your carburetor, it would do nothing.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.
Yep. With that type of air cleaner, the only thing sealing the bowl vents from the atmosphere is your air filter element. The factory air cleaner closes completely to trap any evaporating fuel and send it through the vapor recovery system (charcoal canister) via that solenoid valve.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.