Diesel not getting to injectors

Tiny
LKIDMAN92
  • MEMBER
  • 1995 HOLDEN RODEO
  • 2.8L
  • 4 CYL
  • TURBO
  • 4WD
  • MANUAL
  • 170,000 MILES
I drove for about seven kilometers with the water separator warning light on, and emptied it when I got to where I was going. When I started the car again, it had very little power and the revs varied between 200 rpm's and 1500 rpm's with my foot to the floor. After several times turning the car off and on again it eventually cranked but would not start at all.

I replaced the water separator and the fuel filter. I checked the fuel filter for damage or gunk or any kind of excessive build-up; there was none. I bled the injector pump by loosening the fuel shut off solenoid and operating the primer pump. After several pumps the pump got harder, I pumped several hundred milliliters of diesel out from around the loosened solenoid.

I tightened the solenoid valve again, then cracked one of the nuts connecting an injector rail to the injector. I cranked the engine over and even sprayed a good squeeze of ether in to the air intake before I did so. The engine gave a rough grumble for a second with the ether but promptly died and refused to start.

I have pulled off several hoses to see how far the diesel makes it when I pump the primer. I can get diesel coming in to the intake of the injector pump, I can also get diesel coming out of the return line to the tank, and I can also get it coming out around the solenoid valve when it is loosened. But no matter what I do I cannot get diesel to come out of the injector rails.

Also the first thing I did out of everything was drain about a liter of diesel out of the bottom of the tank to make sure there was not a build up of water. I have since put 15 liters of fresh diesel in there, bringing it up to around 2/3 of a tank.

So my question is broadly, why wont it start? And more specifically, why can I not get diesel to the injectors?

Thank you very much in advance, any help or advice is massively appreciated.

Lyndon
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Monday, July 25th, 2016 AT 4:04 AM

11 Replies

Tiny
RIVERMIKERAT
  • MEMBER
You could have a sludge or algae buildup in the outlet from the pump to the injectors.
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Tuesday, July 26th, 2016 AT 10:13 AM
Tiny
LKIDMAN92
  • MEMBER
Thanks for the reply, can you suggest the best/easiest remedy? It seems weird to me that there could be a buildup there because the old fuel filter seemed pretty clean/in tact save for a little bit of orange liquid (10 ml or less).
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Tuesday, July 26th, 2016 AT 7:28 PM
Tiny
MHPAUTOS
  • EXPERT
Can you send me the engine code, there is a series of these engines that have electric controlled injector pumps that fail with out notice, my stepson had the same problem at first I thought it was the immobilizer but it turned out to be a failed injector pump. If you can advise on the engine code I can check what pump it has and if this problem is likely to be a failed pump.
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Saturday, July 30th, 2016 AT 4:58 PM
Tiny
LKIDMAN92
  • MEMBER
Hi MHP, I'll send it through to you in a few days when I get a chance to return to where the car is broken down. Cheers for the response.
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Saturday, July 30th, 2016 AT 8:31 PM
Tiny
MHPAUTOS
  • EXPERT
Ok, hope it is not what I am thinking, the problem pump is on the 4JH1-TC engine.
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Sunday, July 31st, 2016 AT 1:10 AM
Tiny
LKIDMAN92
  • MEMBER
I thought this one was a 4JB1-T, that was just going off the info on Wikipedia about the timeline of Isuzu engines. But just revisiting then apparently the 4JH1-T replaced the B's in the early 90's. Mines a 95 model so may well be the 4JH1-T in there. Is there any chance it's a problem with the fuel shut-off solenoid? Or do you have any more information on the particular fault?

Cheers
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Sunday, July 31st, 2016 AT 10:06 PM
Tiny
MHPAUTOS
  • EXPERT
I went for the fuel shut off solenoid as well with my step sons car, but it was not the problem, I had the pump off and gave it to my diesel pump guy and when I put it on the bench he just said "it will be stuffed" anyway he did test it and it was knackered, so it was a new pump, second hand pumps are as rare as hens teeth. There gone from the wreckers as soon as they hit the shelf because of the problems with them, but it will be worth pulling the pump and getting it bench tested just to know where you stand.
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Monday, August 1st, 2016 AT 1:47 AM
Tiny
ITUMELENGTUMZA50
  • MEMBER
I have a problem with my 2kd engine, started when I was drive with loss of power my revs were so poor then after a check up I found that when I crank the car I'm not getting diesel from the rail to injectors thus I do get diesel from pump to rail please help
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Tuesday, October 9th, 2018 AT 1:23 AM
Tiny
KEN
  • ADMIN
No diesel to the rail means the primary pump in the tank is not working. Most of the time its the pump or relay that is causing the problem here is a guide to help you see what you are in for when changing the pump out and diagrams below to show you on your car.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Check out the diagrams (Below). Please let us know what happens.

Cheers, Ken
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Tuesday, October 9th, 2018 AT 11:15 AM
Tiny
ITUMELENGTUMZA50
  • MEMBER
Thanks Mr Ken, I checked the car again and now the diesel pressure is correct, but I found out that there is no signal to pump and injectors. Could this mean my computer box is damaged?
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Tuesday, October 9th, 2018 AT 10:40 PM
Tiny
KEN
  • ADMIN
It could can we run the codes to see whats comes up? Here is a guide. OBD1

https://www.2carpros.com/articles/odb1-isuzu-1985-1994-cars-and-trucks-code-retrieval-procedure-and-definition

ODB2

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Did you ever get the problem fixed?

Cheers, Ken

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Wednesday, October 10th, 2018 AT 3:25 PM

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