Early RRC Fuel Tank Connections

Apologies the quote had a link in it which is what posted. Try again. I suspect there aren't many RRC running this system, so may not be massive amount of knowledge wrt to how they work on RRC

"I'll agree with everyone and say they are a bitch to tune but seem to run well when you get it right. The closed loop kit is a definite must have as it allows the ecu to make corrections to the mixture automatically. Also fuel pressure is key, the correct inlet pressure and little to no return pressure"

This is from Jeep forum dated 2004

I'll agree w/ everyone, and say that they are a bitch to tune but seem to run well after you get it right. The closed loop kit is a definite must have, as it allows the ecu to make corrections to the mixture automatically. Also fuel pressure is key, the correct inlet pressure and little to no return pressure.

Quote:

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Originally Posted by drover81

It seems under certain conditions, the tank vents fuel through the spill return. Also appears as though the charcoal canister is plumbed to the carb on one side and on the other, fresh air.

Sent from my Mi-4c using AULRO mobile app

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Sounds like whoever plumbed the EFI system reused the tank to canister line as the return line, not realising the canister needs to function for the tank to vent correctly. Personally I would dismantle the filler neck and fit a bulkhead fitting (nut on the inside) into the filler and plumb your new return pipe there.

It's quite easy to make your own bulkhead fitting, get a 30mm long 12-14mm mild steel bolt and nut, drill it through to 6mm ID or so, grind/machine off the thread for 15mm for the return hose to go on, then assemble the bolt and nut from inside the filler pipe with sealing washers.

Quote:

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Originally Posted by bee utey

Sounds like whoever plumbed the EFI system reused the tank to canister line as the return line, not realising the canister needs to function for the tank to vent correctly. Personally I would dismantle the filler neck and fit a bulkhead fitting (nut on the inside) into the filler and plumb your new return pipe there.

It's quite easy to make your own bulkhead fitting, get a 30mm long 12-14mm mild steel bolt and nut, drill it through to 6mm ID or so, grind/machine off the thread for 15mm for the return hose to go on, then assemble the bolt and nut from inside the filler pipe with sealing washers.

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I think you're on the money - that's what I'm finding with this RRC. Somewhere in its history, there's been a lot of 'well, it kinda, mainly works!'

Cracking idea about the bulkhead too.