Prado Fuel Pump

Submitted: Friday, Feb 26, 2010 at 19:14
ThreadID: 76364 Views:3120 Replies:2 FollowUps:5
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Hi all

Having trouble with the fuel pump on my 2001 prado diesel. Basically the pump only seems to work intermittently when switched to the sub tank. Sometimes it runs okay and other times the motor just dies but runs well when switched back to the main tank. Talking to Toyota they are of the opinion that a solarnoid is malfunctioning and have quoted me $351 for the part plus installation with no guarantee that this will fix the problem.

Has anyone had similar problems or suggestions as to the cause of the problem.

Many thanks

John
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Reply By: Member - ross m (WA) - Friday, Feb 26, 2010 at 21:42

Friday, Feb 26, 2010 at 21:42
Do you mean the injector pump?

I would give Toyota a wide berth if that is their position.

I would check the fuel pick up in the tank 1st. It has some gauze wrapped around it and it does get clogged on some landcruisers.
Imtermittent running is the main symptom.

The next place is to check for obstructions inside the solenoid valve,they also can get blocked and give the same symptoms.

IMO you would be better off dealing with a fuel injection shop or a dedicated diesel mechanic.

If it does need a solenoid ,its possible they are the same as other landcruiser diesels and a wrecker may have one.
I cant remember hearing about one going bad before.
Bosch also make 12volt fuel valve solenoids,it maybe possible to plumb one into the toyota system
AnswerID: 406220

Follow Up By: Member - ross m (WA) - Friday, Feb 26, 2010 at 21:46

Friday, Feb 26, 2010 at 21:46
You say you are having trouble with the fuel pump?
There is no pump at the tank pumping fuel to the injector pump ,except the feed pump inside the injection pump.
I could not see one in the EPC and the other diesel landcruisers do not have one .
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FollowupID: 675905

Follow Up By: westskip - Friday, Feb 26, 2010 at 22:08

Friday, Feb 26, 2010 at 22:08
Thanks for that info Ross.

Being a complete 'noong' as far as diesel engines are concerned I naturally assume that there is a pump taking fuel from the tank to the injectors (or whatever). A friend has just a while ago suggested that it may be a broken/loose wire to the solenoid so perhaps I'll get an Auto Lecky to look at that first.

Thanks

John
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FollowupID: 675912

Follow Up By: get outmore - Friday, Feb 26, 2010 at 22:11

Friday, Feb 26, 2010 at 22:11
An auto leccy would be the best bet
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FollowupID: 675914

Reply By: Member - Phil G (SA) - Friday, Feb 26, 2010 at 23:13

Friday, Feb 26, 2010 at 23:13
John,
For the motor to "die", you would have to have one of the tanks empty. If this is correct, then I think Toyota have got it right. Its a fairly common problem. There are two solenoids - a supply solenoid and a return solenoid. Sounds like the supply solenoid is the one playing up. Its the one with the bigger hoses on it. They live underneath, just forward of the subtank.
AnswerID: 406248

Follow Up By: westskip - Friday, Feb 26, 2010 at 23:22

Friday, Feb 26, 2010 at 23:22
Thanks Phil.

It's a bit of a problem as there is fuel in both tanks and it's only when running of the sub-tank that it is evident. Switch back to the main tank quickly and it runs perfectly.

John
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FollowupID: 675933

Follow Up By: Member - Phil G (SA) - Friday, Feb 26, 2010 at 23:30

Friday, Feb 26, 2010 at 23:30
Thats interesting John. The solenoids simply switch which tank the fuel comes from and which tank the fuel is returned to. As far as I know, they can't be stuck half way, preventing the flow of fuel - but I'm not certain on this.

Maybe there is crap in the subtank????
Maybe there is a split in a subtank hose that is allowing air to be entrained, causing the motor to die? As others have mentioned above, the diesel Prados do not have a pump in the tank - the fuel is "sucked" through the filter and to the motor by the injector pump on the engine, and so can entrain air anywhere along the way.
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FollowupID: 675934

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