LC 100 SUB TANK consumption
Submitted: Friday, Aug 26, 2005 at 22:01
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Sao
G'day,
The fuel consumption on my 2002 HZJ105 (diesel) seems to be about 10% worse when running off the sub
tank compared to the main fuel
tank. Has anyone else found this? The only explanation I can think of is that the fuel return goes to the main
tank only, and not to the sub - is that true?
SAO
Reply By: Trekkie - Saturday, Aug 27, 2005 at 00:48
Saturday, Aug 27, 2005 at 00:48
That would be correct. The fuel return goes to one or the other - not both. I have a long range
tank that replaces the original small sub - My recollection is that the return on
mine is to the original main.
AnswerID:
127047
Follow Up By: Member - Davoe (Widgiemooltha) - Saturday, Aug 27, 2005 at 01:02
Saturday, Aug 27, 2005 at 01:02
Are you sure about that? how can that be? if your main was full then the fuel returning to the main when running of the sub would overflow the main. Utes and 80 series have 4 solonoids 2 for both the sub and main (take and return) I cant believe it is different with a 100
FollowupID:
381597
Follow Up By: BenSpoon - Monday, Aug 29, 2005 at 18:36
Monday, Aug 29, 2005 at 18:36
Davoe, 93-98 Aussie spec petrol 80 models pump from Aux to main. I have not seen any utes with this same setup, but the only utes I have driven are diesel, not petrol.
FollowupID:
381844
Follow Up By: Member - Davoe (Widgiemooltha) - Monday, Aug 29, 2005 at 19:55
Monday, Aug 29, 2005 at 19:55
I know little about petrols but I believe they take and return only from the main and the fuel is transferred from the aux to the main before it can be used (I could be wrong )
Diesals I know for sure as I have spent alot of time under them fixing lines., They have 4 solonoids. 2 for the supply from both the aux and main and 2 for the return again from aux and main. so the fuel is taken and returned to the same
tank
FollowupID:
381854
Follow Up By: Member - Davoe (Widgiemooltha) - Tuesday, Aug 30, 2005 at 01:17
Tuesday, Aug 30, 2005 at 01:17
dohhhhh!! make that 2 solonoids each has 3 nipples one supplys/ returns to and from the motor and the other 2 go to both the sub and main depending on which way they are switched
FollowupID:
381884
Reply By: nick riviera - Saturday, Aug 27, 2005 at 10:29
Saturday, Aug 27, 2005 at 10:29
I note the same on my HZJ105 sub, i have put it down to the gauge not having a trully linear movement over the whole range ie i can drive 120 km on the first 1/4 but by the last 1/4 of a
tank i am lucky to get 50 -60 kms and my fuel light comes on before needle falls below E, always has since day one.
If the returning fuel was going to the main there would be overflowing fuel (when full).
AnswerID:
127065
Reply By: Billowaggi - Saturday, Aug 27, 2005 at 13:37
Saturday, Aug 27, 2005 at 13:37
Hi all. The return fuel always goes back to the
tank that is being drawn from .This is controlled by solenoid operated valves in the supply and return lines, it is possible for wiring to be knocked off but as suggested this would lead to overflowing of one of the tanks when full.
Regards Ken.
AnswerID:
127076
Follow Up By: Member - Davoe (Widgiemooltha) - Saturday, Aug 27, 2005 at 20:21
Saturday, Aug 27, 2005 at 20:21
solonoid problems are not unknown and can cause problems depending on where the fault is I have suffered a few and it varys from overflowing fuel tanks to the vehicle failing to proceed
FollowupID:
381667