GU SUB TANK SWITCH
Submitted: Wednesday, Aug 11, 2004 at 19:38
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MARK
HI GUYS
I WOULD LIKE TO KNOW WHAT WOULD HAPPEN IF I WAITED TILL THE MAIN TANK RAN OUT BEFORE CHANGING OVER TO THE SUB TANK ON MY 4.2 TD PATROL .
I HAVE CALCULATED THAT THRERE IS ABOUT 25L STILL IN THE MAIN TANK WHEN THE
ORANGE EMPTY LIGHT COMES ON , CAN ANYONE CONFIRM THIS ? WANT TO SEE HOW MANY KMS I GET WHEN THE LIGHT IS ON ?
Reply By: duncs - Wednesday, Aug 11, 2004 at 22:30
Wednesday, Aug 11, 2004 at 22:30
I haven't done it in the GU but I did have the misfortune to run out in the GQ.
When it happened I was able to coast down the
hill and pull into a service station. I filled up and turned the key not really expecting much success but it fired up and ran, a bit rough at first but it sorted itself out.
Apparently theyve self priming injectors and can cope with running out of fuel.
You don't need to prime the injectors if you change the fuel filter just pump it up with the manual pump on the filter itself.
If you wnat to try it I would turn it off as soon as it coffs and then switch the reserve on, let it drain through for a while and re-start the engine.
Let us know how yo go.
Duncs
AnswerID:
72213
Reply By: Member - Roachie (SA) - Wednesday, Aug 11, 2004 at 22:41
Wednesday, Aug 11, 2004 at 22:41
Mark,
Three things to say......
1) PLEASE DON"T SHOUT....(it is considered rude to use upper case ol' mate)
2) Although I've got a 145litre replacement tank, it still uses the original sender unit in the tank. I have driven around 100klm with the
orange light on and it took around 135 litres to fill the main tank.
3) Recently I had a bad experience out in the bush. I'd been camped with the Patrol facing up
hill on the side of the track all night. Next morning we decided to go for a short drive up the track. I started her up and idled for about 5 minutes (as i always do) and Gerk (who was with me in his truck) and I started off up this fairly steep (low range)
hill. My main tank gauge was showing between quarter and half (closer to quarter though). My sub tank was still full. As I started to climb I lost nearly all power. I pulled up and used the hand throttle to hold the revs at about 1100. Any harder on the loud pedal and she'd cough and almost stall......take my foot off the pedal and she'd die in the bum. So with the 1100 showing and hand brake on (gotta love transmission hand brakes), I got out and chocked the wheels and lifted the bonnet. Note that wife and kids abandoned ship and left me to my own devices. I've got a Lucas/CAV filter system with glass bottom bowl and 1st thing I noticed was small air bubbles coming up from the bottom bolt through the diesel in the glass bowl. I soon twigged that she was sucking air. Jumped back in and hit the aux tank switch. About 2 minutes later she was purring again; nice as you like!!!!
Hope this helps.....
Cya
AnswerID:
72220
Reply By: basecamp15 - Thursday, Aug 12, 2004 at 20:24
Thursday, Aug 12, 2004 at 20:24
I ran my main tank down to see if my low fuel light was actually working, it wasn't and I ran out.
It was a simple matter to leave the car on 'on' while having the sub tank pumping. During this time I was hand priming using the pump on the fuel filter and when she was primed, started her up no worries.
Being a 4.2 turbo I had to idel it for a bit to get enough from the sub tank into the main tank before taking off again.
And you will pump a fair bit each time you start the engine too. It's possible to actually have only half your subtank left before actually draining it yourself if you do a lot of stop start driving.
Cheers, Mark.
AnswerID:
72365
Reply By: Pluto - Friday, Aug 13, 2004 at 09:14
Friday, Aug 13, 2004 at 09:14
Mark,
My guesstimate on the reserve capacity is similar to yours, or a little less. I have run my 2.8GU for about 150km with the warning light on before refuelling. I believe I had less then five litres left when I refuelled.
As for leaving the sub tank transfer until the last moment, I don't think there is any reason to do this. You run the risk of damaging the fuel pump and (as Captain pointed out) waste a lot of time getting started again. My regular practise is to transfer the sub tank once the main tank is showing room to take the transfer. Afterall, the fuel in the subtank is not available for use untill it is transfered. This also maximises the flushing of the sub tank and avoids the slightest chance of stale fuel.
Pluto
AnswerID:
72430