Emissions tuna can under fender

[DasBoot]

Hey folks,

Anyone know what the tuna can lookin deal is up under the passenger front fender on a 71 Yorker? It has 2 very tiny vacuum hoses on it.

Is it a primitive charcoal canister? I'm very familiar with the A-body type cans and know they help prevent the garage from filling up with gas vapor when parked overnight. The good news is, this car is too big for my garage so it parks outside.

The vacuum hoses running to it are cracked and likely causing idle/drive issues and would rather just delete all this nonsense for now if possible. Any advice?

 

[CBODY67]

Probably a vac reservoir for the hvac system. The evap emissions canisters will have a fuel line-size hose going to them from the tank and the carb, with the evacuation line going to the carb pcv line/fitting, usually.

The vac reservoirs which Ford used looked more like smaller diameter grapefruit juice cans, with a plastic fitting for the vac lines.

CBODY67

 

[DasBoot]

Could be, but the vacuum amplifier black globe thing sits proudly on the inner fender by the alternator. I'll have to take pix of this thing to show you.

 

[CBODY67]

"Vacuum Amplifier" was on the '74-'78 era cars, a flat and round item with a vacuum source and several vacuum lines going from it to various things, mounted vertically on the rh valve cover.

CBODY67

 

[DasBoot]

Tuna can has red arrow pointing to it.

And you're right, the vac amp is that thing that looks like a hockey puck near the valve covers. So whats the black globe thing (circled yellow)?

 

[CBODY67]

On page 24-6 of the 70-71 Chrysler parts book, the picture of the CDPY a/c system with ATC shows TWO vac reservoirs. When you find the round one, the other one's lines should splice into those lines. No illustration for non-ATC system on those cars.

The item circled in yellow is the typical vacuum reservoir, as my '70 Monaco has, for a non-ATC system, and other C-bodies of that general vintage.

CBODY67

 

[Big_John]

They are both vacuum amplifiers.

The metal one is a Trico and they also used them on Fords and GMs.

 

[Big_John]

Do you have a vacuum trunk release? That might be what the metal one is for. The other is for the A/C.

 

[DasBoot]

Yes, I have vac trunk release. Which seems to work despite the ancient vac lines going to the tuna can. Sounds like I need to keep this stuff alive instead of ripping it out.

 

[CBODY67]

Yes, I have vac trunk release. Which seems to work despite the ancient vac lines going to the tuna can. Sounds like I need to keep this stuff alive instead of ripping it out.

A transmission shop owner once told me that when Chrysler did something (even Ford, too), there was a reason. At GM, it depended upon who was making decisions that day.

"Reservoir", just quoting parts book terminology.

CBODY67

 

[MarPar]

Yes, I have vac trunk release. Which seems to work despite the ancient vac lines going to the tuna can. Sounds like I need to keep this stuff alive instead of ripping it out.

yes please.

 

[DasBoot]

A transmission shop owner once told me that when Chrysler did something (even Ford, too), there was a reason. At GM, it depended upon who was making decisions that day.

"Reservoir", just quoting parts book terminology.

CBODY67

Fair enough. It all means the same thing. Thanks for the help gang. Gonna go make some tuna sandwiches now....

 

[Ross Wooldridge]

Late to the party... vacuum trunk release.

 

[jollyjoker]

Red arrow? Vacuum trunk release canister.

 

[commando1]

The "tuna" can (I call it a mini-coffee can) mounted on the passenger side inner fender is for the HVAC vacuum controls. It is not an "amplifier". There is a vacuum "amplifier" mounted on the rear of the intake manifold on the smogger engines.

HVAC VACUUM CAN:

EMISIONS VACUUM AMPLIFIER:

There is NO storage can or amplifier for the VACUUM TRUNK RELEASE. The TRUNK RELEASE button acts simply as an on-off valve for the mainifold vacuum.

 

[Big_John]

There is NO storage can or amplifier for the VACUUM TRUNK RELEASE. The TRUNK RELEASE button acts simply as an on-off valve for the mainifold vacuum.

Oh really?

From my 70 FSM:

 

[jollyjoker]

FYI . . . this vacuum canister is Trico 85595-43, if my memory serves me correctly (look for the tiny numbers on the silver vacuum line dome). It was used in MULTIPLE MoPar applications. Many MoPar part numbers . . . dependent upon the application and the type of mounting bracket. The one shown is definitely part of the vacuum trunk release setup (I pulled a complete setup from a boneyard NYer years ago, and installed it in my 65 Monaco - it still works perfectly). Other uses were HVAC . . . I seem to remember that one version was in 70 Coronets, and others were part of the "Air Grabber" mechanism. I know I have a list at home - I think I tracked down maybe 7 or 8 different MoPar part numbers.

 

[commando1]

Oh really?

From my 70 FSM:

View attachment 145344

Damn Fuselages. Always screw me up.
Thanks. I'll make the edit.