Reply With QuoteSounds wrong. Breathers should be up high, returns can be low.
Master
SubscriberHi All - I'm trying to correct a few issues and it appears as though the spill return line has been plumbed into the fuel tank breather (and vice versa) - yet I can't locate anything to verify.
Hoping someone can check theirs and advise.
I have an early RRC Fuel tank (external fuel pump) - like this one:
Range Rover Classic Fuel Tank | Rimmer Bros
Spill return is plumbed up higher on the same side as the fuel tank level indicator (can't seem to locate a photo on the net of that side of the tank).
Breather is plumbed to the outlet coming out from the bottom of the tank (visible in the above link).
Is the plumbing back-to-front?
Thanks.
Current: ‘16 Disco Sport (7seater) aka « Family Bus 2 »
Sadly Gone: '77 RRC 2 Door aka "Beast"
Gone: '92 RRC Vogue SE aka "The Family Bus"
Long Gone: '99 Td5 Defender aka "The TANK!"
Wizard
SubscriberSounds wrong. Breathers should be up high, returns can be low.
ForumSage
Hi,
The return line goes on the nipple / pipe that is right in the middle of the Rimmers image next to the the front mounting bracket.
They can get closed with rust so check that, or drink more fuel.
DL
Master
SubscriberOK - sounds like it is back-to-front.Originally Posted by 350RRC
Thanks.
Current: ‘16 Disco Sport (7seater) aka « Family Bus 2 »
Sadly Gone: '77 RRC 2 Door aka "Beast"
Gone: '92 RRC Vogue SE aka "The Family Bus"
Long Gone: '99 Td5 Defender aka "The TANK!"
Master
SubscriberSo I've started scoping what I need to fix the problem. Can anyone advise what the spill return fittings are? (AN4?)
The PO cut the original spill return line the engine bay and I need to plumb the 3/8 fuel return into it (the car is running a Holley pro-jection system). The projection system requires less than 4psi pressure in the spill return too...
Current: ‘16 Disco Sport (7seater) aka « Family Bus 2 »
Sadly Gone: '77 RRC 2 Door aka "Beast"
Gone: '92 RRC Vogue SE aka "The Family Bus"
Long Gone: '99 Td5 Defender aka "The TANK!"
ForumSage
I would say that it's been plumbed the way described in the first post is because the puny return line and (possibly rusted) spigot into the tank was creating more than 4 psi of pressure.
Also if the tank is full the return would be pushing fuel back in against more fuel if using the stock spigot.. 4 psi is not much at all.
I'd start thinking some sort of tee fitting for return / breather from the breather source.
DL
Master
SubscriberYup, my backup plan is to tee into the fuel filler breather and plumb the tank vent into it. It might be a bit of a bugger considering the fuel filler breather is about 15mm ID, but possibly the nearest way to fix the problem.
Current: ‘16 Disco Sport (7seater) aka « Family Bus 2 »
Sadly Gone: '77 RRC 2 Door aka "Beast"
Gone: '92 RRC Vogue SE aka "The Family Bus"
Long Gone: '99 Td5 Defender aka "The TANK!"
ForumSage
Hi,
Given the modded breather / return set up and the modded injection set up.......... what is the problem that you're actually trying to solve?
DL
Master
SubscriberIt 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
Current: ‘16 Disco Sport (7seater) aka « Family Bus 2 »
Sadly Gone: '77 RRC 2 Door aka "Beast"
Gone: '92 RRC Vogue SE aka "The Family Bus"
Long Gone: '99 Td5 Defender aka "The TANK!"
Wizard
SubscriberThis is a comment about the Holley Pro Jection system in a Jeep forum that might be of interest. Thread was about what makes Pro jection suck. consensus was that it didn't but needed correct tuning.
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.
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