Strange Diesel Fuel Fault

Submitted: Monday, Mar 22, 2010 at 20:41
ThreadID: 77095 Views:2522 Replies:6 FollowUps:5
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Went for a 900k jaunt over the weekend and was almost home with one tank reading empty and the other on 1/4 when suddenly lost power. Whilst slowing from 100kph I quickly switched to the almost empty tank and just managed to get power back before coming to a stop. Worried about fully draining that tank so a few minutes later tried the 1/4 full one again with same result of power loss. Back to the "empty" tank and just made it up my driveway coughing and spluttering with the engine failing completely as we pulled into the carport! Allah surely was sitting on my shoulder!

Now the interesting thing is that in accordance with thread 76538 I had, for the first time, added 500ml of two-stroke oil to the tank that gave the trouble. Not saying that it caused the problem but its hard not to be suspicious.

Anyway, I'll start to examine the system tomorrow. Maybe a dodgy tank-selection solenoid valve. Fair dinkum, if it is I may consider ripping them out and replacing them with manual valves for tank selection. After-all, I can't afford to have some stupid device such as a solenoid valve stuff up in the middle of nowhere and anyway, I don't need to select tanks whilst actually driving.

By the way, I had put the two-stroke into only one tank and had changed supply a couple of times to observe any performance difference. There was none that I could detect, certainly no difference in engine noise or response. So endeth the experiment!

Cheers
Allan

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Reply By: Rockape - Monday, Mar 22, 2010 at 21:14

Monday, Mar 22, 2010 at 21:14
Allen,
you may have read this but if you haven't this should alay any of your fears about 2 stroke oil at 200:1 in a tank of diesel.
2 stroke test
AnswerID: 409964

Follow Up By: Member - Allan B (QLD) - Monday, Mar 22, 2010 at 21:35

Monday, Mar 22, 2010 at 21:35
Yes, thanks, I had read that link during the 76538 thread.
It's not that I have fears, merely wondering if the oil I added precipitated a latent condition.

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Allan

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Reply By: Member - Andrew L (QLD) - Monday, Mar 22, 2010 at 21:27

Monday, Mar 22, 2010 at 21:27
going from your profile, you have a HZJ78 series, which is a 1HZ, which is a mechanical fuel injection.

1) Some crook fuel that has settled to near the bottom of the tank (problem started at near empty and 1/4 full)

2) When did you last change your fuel filter?

3) Change your fuel filter, and check for the culprit by draining/inspecting the old/replaced filter.
AnswerID: 409966

Follow Up By: Member - Allan B (QLD) - Monday, Mar 22, 2010 at 21:40

Monday, Mar 22, 2010 at 21:40
Thanks Andrew,

Yes a 1HZ.

Fuel filter was changed about 7000k ago. It will be the first place I examine.

But why will it run on one tank but not the other? The filter is common to both.

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Allan

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FollowupID: 679915

Follow Up By: Member - david m2 (SA) - Monday, Mar 22, 2010 at 23:35

Monday, Mar 22, 2010 at 23:35
I have had the same trouble with a tank fuel of environmentally friendly diesel.
i try and only use premium diesel/ No bio fuel.
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FollowupID: 679931

Reply By: get outmore - Tuesday, Mar 23, 2010 at 03:38

Tuesday, Mar 23, 2010 at 03:38
dodgey gauge you were out of fuel - been there done that with a 79
AnswerID: 409996

Follow Up By: Member - Allan B (QLD) - Tuesday, Mar 23, 2010 at 08:30

Tuesday, Mar 23, 2010 at 08:30
Nah, dipped the tank when I got home........ there was 1/4 tank-full there.

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Allan

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FollowupID: 679944

Reply By: TerraFirma - Tuesday, Mar 23, 2010 at 11:32

Tuesday, Mar 23, 2010 at 11:32
Sounds like a fuel blockage which isn't uncommon.
AnswerID: 410042

Reply By: Member - Allan B (QLD) - Tuesday, Mar 23, 2010 at 12:06

Tuesday, Mar 23, 2010 at 12:06
Thanks chaps, everything checked OK on the Troopy.

IT WAS ME !!!! Seems I let the "empty" tank get TOO EMPTY and got air into the fuel line. Put some diesel into the tank and operated the primer plunger ........ all now OK. Trouble is that I am much older than the Troopy!

May have stopped and checked that at the time on the road but it was the Bruce Highway Motorway with no space to pull off the road with semis going past at 110k and home not far away. The shoulder along that stretch is not wide enough to pull clear of the lane.......... not good Mr Main Roads!

Cheers
Allan

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AnswerID: 410050

Follow Up By: Member - William H (WA) - Thursday, Mar 25, 2010 at 00:39

Thursday, Mar 25, 2010 at 00:39
Now that you have let the tank get to empty....when you take the fuel filter off, tip it into a clean container and see if you have some crud in it...might be an indication of what's in your tank's,i change my filters every 5000 thousand klick's and do this every time,so far so good
I also run the ash less 2stroke oil in my fuel and so far the motor runs quieter and i have a little more power, the oil in the motor isn't as dirty, as was before i started to put it in,the oil is still clear at 3000 klicks compared to before i put the 3 stroke in,i will send a sample away at the next oil change to be looked at.

Cheers for now...Williamh...Bunbury...WA.
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FollowupID: 680173

Reply By: Member - Graham H (NSW) - Tuesday, Mar 23, 2010 at 19:27

Tuesday, Mar 23, 2010 at 19:27
Fuel cap is not breathing on the 1/4 full tank so is sucking a vacuum
AnswerID: 410103

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