Improved sub tank transfer rate.

[Potsy]

I don't think it's the self test as the gauges have changed before I actually start the car. If my main tank is almost empty and the sub half full I can see a drop of around 1/8 of the sub tank in a couple of days (have a work vehicle so Patrice may sit dormant for a couple)
Now you mention it mud runner both tanks make a hiss when the caps are removed but I've never really taken note of whether it's positive pressure or a vacuum, usually to busy staring at my nissanpatrol.com.au sticker.
Please excuse my silly questions but where might I find the breather tubes? Do they come straight off the top of the tanks as I may extend them somewhere a little higher to prevent s#*t getting in.
Will definitely take not of what happens when I remove the caps next time....

[TimE]

Digging up a really old thread but ..............Hiss good, no hiss bad !

My New LRA main tank fitted by TJM Darwin developed a nice leak from the top after I got back home to Canberra. The problem was the way the fuel hoses were fitted, they kinked and rubbed a hole through one line, thus leak. Now the last fill before I noticed the leak I distinctly remember hearing no hiss when I removed the filler cap, thought it strange at the time, I assume that air was entering back into the tank via the holed hose (fuel return hose I assume).

TJM Canberra fixed the problem, no charge, and confirmed that he fuel line had been routed the wrong way, rooted is what I thought.

So, my take away from this is if no hiss maybe an issue with the lines into the tank

[4bye4]

TJM Canberra fixed the problem, no charge, and confirmed that he fuel line had been routed the wrong way, rooted is what I thought.

A good bit of PR for them. I often judge companies by how they react when it all goue wrong rather than by their advertised quicker, better, cheaper touts.
Glad they fixed it and you are 100% go again.

[Bigcol]

hiss is good

you have a sealed tank
you have a mechanical pump sucking fuel into engine

open fuel cap - air rushes in

good sign

[Hodge]

Dumb Hodge question time ... But... If there is a hiss when undoing caps , doesn't that mean breather is blocked somewhat ?
If the tank only takes a breath when undoing caps , what purpose does the breather have ?

Both my tanks hiss . When Cuppa originally wrote this thread I was always meaning to check my breather. Forgot about it.

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[mudski]

Dumb Hodge question time ... But... If there is a hiss when undoing caps , doesn't that mean breather is blocked somewhat ?
If the tank only takes a breath when undoing caps , what purpose does the breather have ?

Both my tanks hiss . When Cuppa originally wrote this thread I was always meaning to check my breather. Forgot about it.

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Yeah both mine do too. Both breathers on my tanks are clear though. Im wondering if this is normal as our Commodore does the exact same thing.