Fuel System Problems

Submitted: Monday, Apr 14, 2008 at 10:08
ThreadID: 56614 Views:2391 Replies:6 FollowUps:2
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I recently was advised to clean and flush my GU Patrol fuel tank and lines to clear of suspected sediment. I took my patrol to a local mechanic and aske them to provide this service, which they agreed to do.
At the time I also asked if they could install a fuel filter that has a glass sediment trap on the bottom of the filter. I had seen these on other Patrols and thought was a good idea so as I could see if anything was being caught.
The job was completed and I paid for the job.

Problem 1. When I picked the patrol up, I noticed the "Sub Tank" light was illuminated on the dash. I also noticed the sub tank selector switch would not light when I pushed the button. There is fuel in the sub tank and it too does not seem to being used.

Problem 2. The fuel filter I asked to be installed was connected in series with the factory fuel filter. They mounted it about 2-3 Inches above the factory filter, just in front of the brake master cylnder on a bracket. The problem is now when the car is parked uphill on a slope of more than approx 20 degrees, the patrol will start then stall. I have to open the bonnet and pump and prime the fuel up to get the patrol to start. if I park on flat ground or downhill, I do not have this problem. The fuel pump now seems has a wierd ticking, vibrating sound, especially after priming the fuel.
I took my patrol back to the mechanic and he not sure of what the problem is and says he hates diesels for this reason. I need some assistance to solve these problems so I can tell him what to do!!
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Reply By: Member - Troll 81 (QLD) - Monday, Apr 14, 2008 at 10:25

Monday, Apr 14, 2008 at 10:25
Sounds like you need a new mechanic to be honest

The sub tank thing is a very common problem and there's an issue with your earthling
AnswerID: 298413

Reply By: Robin Miller - Monday, Apr 14, 2008 at 10:28

Monday, Apr 14, 2008 at 10:28
Had the sub-tank light problem in my petrol GU last week
and resetting the module by disconnecting the battery overnight
solved that one - but not until after I went thru everthing
even pulling the sender unit out of the sub tank , because
I made a dumb mistake in that the first thing I did was
to disconnect the battery to reset the module but I forgot
that I had an aux battery in circuit at the same time and
I really hadn't reset the module.

On the filter problem, I am not as familar with the diesel setup but I'd first verify that it is fixed by removing the new filter , and then consider wether the problem is fuel draining back.
Robin Miller

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AnswerID: 298414

Reply By: Member - Dalb (SA) - Monday, Apr 14, 2008 at 11:16

Monday, Apr 14, 2008 at 11:16

I know nothing about this subject myself, however when I bought my s/hand LC100TD last year I asked my mech to put in a glass bottomed fuel filter, as well as the existing one. He advised me not to do this as two filters are possibly too much load for the fuel system. I now just have the glass one.
Hopefully others more knowledgable will comment on this.....

Cheers, Dalb

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AnswerID: 298418

Follow Up By: Member - Oldplodder (QLD) - Monday, Apr 14, 2008 at 16:10

Monday, Apr 14, 2008 at 16:10
Same with the pajero, the lift pump on the injector pump is not too strong.
So when I put a 2nd filter in the system, I also put an electric fuel pump in near the tank, connected to the ignition.

Big advantage now is after doing the fiters, I just turn the ignition on (don't start the engine) and the electric fuel pump primes the system.

The 2nd filter is actually first in line near the tank, and is the first filter off a landcruiser. Less than $10.00 for a cartridge.
FollowupID: 564551

Reply By: Member - Lewis K (QLD) - Monday, Apr 14, 2008 at 11:46

Monday, Apr 14, 2008 at 11:46
Biggest advantage of the glass fuel bowl is that you can see any water that is trapped and get rid of it long before it can do any damage. Usually a warning light associated with water in the filter but I find that anything that relies on electrics is always suspect unless tested often. Solution for my Tojo was to fit a new fuel filter with the glass bowl at the bottom. Still only one filter in line.
AnswerID: 298424

Reply By: Member - Roachie (SA) - Monday, Apr 14, 2008 at 12:03

Monday, Apr 14, 2008 at 12:03
Okay, you need to disconnect the batteries for about 10 minutes to reset the sub tank module.

Secondly, with regard to the additional filter, you have 2 choices IMHO....

(a) get the mechanic to change the original filter over to the CAV type with the glass bowl....IE: get an adaptor that screws onto the original filter's housing and you then have the glass-bottomed filter where the oe filter used to be.

(b) leave the filters set-up the way they are, but instal a FACET pump which will rovide a small amount of additional pressure on the fuel lines. This has 2 benefits: (1) it helps the OE lift pump, which is now struggling to get fuel from the tank because of the extra filtering that is going on.... (2) it provides an easy way to prime your fuel system after you change your filter/s. The pump is only small.... I had mine mounted on the inside of the chassis rail just in front of the sub tank.....there is a good spot there to cut into the main fuel line that makes this job easy to do.

In addition, I also run one of these:


This will keep your filters free from gunk a lot longer anyway.

AnswerID: 298425

Follow Up By: Member - Oldplodder (QLD) - Monday, Apr 14, 2008 at 16:12

Monday, Apr 14, 2008 at 16:12
I have the facet too.
Only small but rated at over 30 gals/hr, more than enough for the engine.
FollowupID: 564552

Reply By: Michael ( Moss Vale NSW) - Monday, Apr 14, 2008 at 14:05

Monday, Apr 14, 2008 at 14:05
I have the same problem with my subtank.. i tried to reset by battery disconnection but to no avail. I took it to Nissan, they fixed it last Monday and all was well, i could now empty the sub tank, but on Thursday morn, the sub tank light was on again and the sub tank could not be emptied again..On the Invoice of $185, it said it was a bad connection on the subtank sender,, So i guess i will take a look at it myself.. Michael
Patrol 4.2TDi 2003

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