WH M1A1 Tank and OEM EVAP System

[neilvonarb]

I have a ‘74 Bronco I’m getting ready to put EFI in and I’m looking to switch to a WH M1A1 EFI tank while I’m doing it. I still have the original EVAP system with the charcoal canister and plastic condensing tank behind the drivers seat. There are two lines that go from my original gas tank to the condensing tank (I’ve read one is for venting and one is a return for any reformed gas liquid) but there is only one vent line on the M1A1 tank. Does anyone have experience with this specific scenario? Is it as simple as a T or wye into the new single vent location on the new M1A1 tank?

 

[armynavy17]

I'd highly recommend converting to the later style of EVAP system. If the tank you have behind the driver's seat it's cracked yet, it probably will be soon. I'm a big fan of getting gas out of the passenger compartment.

Are you planning on running an aux tank? If not, the later style EVAP routing is very easy. Run a line from the single tank EVAP port to a rollover valve (https://store.delorean.com/101402-rollover-valve.html) then up to the engine bay to a '80-'96 bronco charcoal canister (https://shop.advanceautoparts.com/p...340-P?vehicleIdSearch=4355&isAllVehicle=false).