Gutless on petrol

Submitted: Thursday, Feb 02, 2012 at 15:30
ThreadID: 91612 Views:2132 Replies:5 FollowUps:12
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Just wondering if anyone can assist with a problem I have.
I have a dual fuel 99 model Prado V6. When I flick it over to petrol it drops power, and has shut down a couple of times....until I flick it back over to gas.
I've removed the ECU fuse, run injector cleaner through it, changed fuel, changed the filter. Still no luck. Has anyone had the same problem?
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Reply By: Member - Tour Boy ( Bundy QLD) - Thursday, Feb 02, 2012 at 16:22

Thursday, Feb 02, 2012 at 16:22
Hi Grant,
Have you ever run it out of petrol?
That aside I would say from experience that the fuel pump is lazy time to replace it I'd say.
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Reply By: Member - Blaze - Thursday, Feb 02, 2012 at 17:04

Thursday, Feb 02, 2012 at 17:04
Hi Grant,

I have a dual Fuel Mitsi, which have the Fuel pump in the tank, I had exactly the same symptons and it turned out to be that the pump filter was full of rubbish and some had got to the pump and it was on its way out, either way check fuel pump pressures first.

AnswerID: 476669

Reply By: Ross M - Thursday, Feb 02, 2012 at 17:36

Thursday, Feb 02, 2012 at 17:36
Take the fuel delivery line off just after the tank and fit a rubber fuel hose to it.
Aim it into the tank filler and get someone to turn on the ign. Fuel should squirt out of the hose and you can also place your finger over the end to gauge pressure, similar to garden hose pressure should be there. A bit less perhaps.

If it has flow and pressure then it is not the pump.
Note: When the ignition is on the motor is not running so the pump will stop in 10 sec or so. May have to try a couple of times to fill hose and get a feel for it.

For safety reasons make sure there are no ignition sources nearby while you do this check. No use in burning you and the truck and the shed.

Refit the hose to the fuel system.
Now remove the return hose to the tank and fit the rubber test hose to it.
This can be tested the same way and should deliver pressure to the end of the rubber hose. If you don't have the same flow and pressure being developed the fuel filter is restricting it and will need replacing before you go and look further.

Ross M
AnswerID: 476670

Follow Up By: dbish - Thursday, Feb 02, 2012 at 17:47

Thursday, Feb 02, 2012 at 17:47
Magnas had a simmilar problem & it was the in tank pre pump Gauze filter. Wouldblockup with crap & restrict flow. Just replace it.
FollowupID: 751818

Reply By: member-PradoMad - Thursday, Feb 02, 2012 at 21:24

Thursday, Feb 02, 2012 at 21:24
Hi there
got the same Prado. Had similar problem with mine...
turned out to be a dirty air sensor, apparently it does not affect performance when running on gas.
hope this helps. find a good gas specialist!
AnswerID: 476703

Follow Up By: Member - Grant- Friday, Feb 03, 2012 at 04:40

Friday, Feb 03, 2012 at 04:40
Thanks PradoMad.
Could you assist me in locating the sensor, and how was it cleaned?
FollowupID: 751874

Follow Up By: Kimba10 - Friday, Feb 03, 2012 at 08:52

Friday, Feb 03, 2012 at 08:52
Grant the airflow or maf sensor is located on the inlet hose of the airfilter, there is a plug on top with two screws, remove it totally then by yourself some CRC Maf cleaner and give it a good spray/clean but dont touch it with your fingers and dry it out before putting back in, the actual sensor wire is inside the housing, you will see it when you remove it. I have a can of it in my shed Ive used twice not sure where you are located Im in Penrith Sydney your welcome to drop in and use it if you want as its still virtually full save buying a new one..I dont think this will be your problem though. Do you run it on petrol on a regular basis ?? like say every second or third tank of gas or do you just start on petrol let it flick to gas then run on gas all the time ?? Some times due to lack of use the injectors will gum up and not pulse properly. Also I noticed you have a snorkel, you obviously have an equalizer tube fitted between snorkel and mixer other wise it wouldnt run on gas either. Im sorry I know alot of people run LPG and never have any issues but the worst thing I ever did was convert my 90 to LPG, just niggly little problems with mine all the time and stalling under emergeny braking was one of them including raw fuel dropping/over flowing on hot days, I sold the vehicle got another petrol prado and will never go LPG again. Just my personal opinion.................
FollowupID: 751886

Follow Up By: member-PradoMad - Friday, Feb 03, 2012 at 16:24

Friday, Feb 03, 2012 at 16:24
I almost converted back to petrol as driving range in the outback is very limited; however the Prado runs beautifully on gas and I thought for those 1 or 2 outback trips I just have to get some jerry cans.
My next Prado will be diesel!!
FollowupID: 751927

Follow Up By: Kimba10 - Friday, Feb 03, 2012 at 17:14

Friday, Feb 03, 2012 at 17:14
Yeah JS I bought the 90 in a disel after I had the petrol 90, both grande's, the 1kz did the head at 103k so wasnt impressed but I new it was one of those things, either it will or wont go just deal with it when it does, so 4g later was done. We were extremly lucky when we bought and sold the diesel, was one owner and belonged to doctors but when they advertised it they went by the redbook prices of a petrol not diesel. We got it for 23k at the time, did the lift,bullbar,barrier all the usual crap we add these days did a few trips in it the last one was when the head went and we sold it for 27,800 so lost very little over the time we had it (just over 2 years) BUT I wouldnt buy a 1kz again, gutless, head issues, and not economical, roughly 13'14s L per 100 round town and unless you want to drive like miss daisy all the time on the freeways your around the 11L per 100 freeway only driving. I just did fuel consumption again on my 120 at xmas, same trip up the coast as last time, no changes to vehicle only probably a bit more weight, wife and I gave up smoking last year in June so a few more kilos on borad LOL and the last tripp was 11.6L per 100 and at this xmas just gone 11.8L per 100, sums done accurately start with both tanks full and refill chockers again every time, now this is in a 120 GXL auto with bullbar, driving lights, cargo area chockers, waeco etc. Im extremely happy with that and got a heap of poer to go with it, we were running late to get home due to one of the oldies slipping from one of the patrols and ripping the front half of her leg, nealry to bone so did emergency run to hospital, then had to go back pack up and get home this was at 10.45 at night and had to work the next morning so I wasnt hanging around (115,125, 130 in some places) and got the 11.8. I reckon you would get high 10's with extremly careful operation of the throttle lol. The D4D's are great on fuel but injector issues worry me when the warranties up, at roughly $800 a pop thats scary if you pick up crap fuel not to mention pump as well. Yes I pay more at the pump weekly ut would have cost me another 10g for a D4D and definately wasnt going the 1kz in a 120, heavier again over the 90 series..............
FollowupID: 751929

Follow Up By: Kimba10 - Friday, Feb 03, 2012 at 17:18

Friday, Feb 03, 2012 at 17:18
Jeez, I wish they had an edit button for spelling mistakes. I need to reread before hitting submit.sorry for the spelling............
FollowupID: 751930

Follow Up By: member-PradoMad - Sunday, Feb 05, 2012 at 17:19

Sunday, Feb 05, 2012 at 17:19
just clarifying; you got a 120 series, petrol, and it does 100km with less than 12 liters?
I need to reconsider in that case as I thought it would be at least 13/14 L per 100.
But then again I will be towing a Jayco off road camper trailer..?!
FollowupID: 752185

Follow Up By: Kimba10 - Sunday, Feb 05, 2012 at 22:44

Sunday, Feb 05, 2012 at 22:44
Hi JS, yep under 12's on the freeway, but remember at the moment I'm running standard grantrecks, I do have the standard soverign (spelling) alloy bar,driving lights, barrier, fridge in back and loaded BUT no off road, about 730k was freeway driving the rest was in and out of town etc. Round town its roughly 16 depending on how you drive it. Boot it all the time and you will start to climb upto 18/20, drive sensible and I dont mean like miss daisy and yes you will get 15/16's. My old 1kz was approx 14s round town the only way I ever got under 10 was sitting on 90 to 95 on the freeway other wise it was 10.8/11's get a head wind 15/16, sit on 110/120 you will be upto 14's, this was in the 90 with auto box (grande) Towing in the 120 petrol obviously depending on weight I reckon (just guessing here) would be 15+ I would think. There is a website called and there is heaps about fuel consumption with all prados just get the write section. Great website for anything about pradoshe best I ever got out of my 97 grande 3.4 petrol running on petrol was 12.2L per 100 doing the exact same trip. Never got under this...........Cheers
FollowupID: 752225

Reply By: member-PradoMad - Friday, Feb 03, 2012 at 08:43

Friday, Feb 03, 2012 at 08:43
the air sensor is just a small plug that sits on top after the air filter.
just be careful when you take it out as it is very sensitive.

not sure how it was cleaned.

apparently a new cost about $ 250.00

hope this helps.

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AnswerID: 476737

Follow Up By: Member - Grant- Friday, Feb 03, 2012 at 10:17

Friday, Feb 03, 2012 at 10:17
Thanks all for your assistance.
I will clean the air sensor and cross my fingers. A new fuel pump is $730 just for the part!
I'll also post the conclusion when i've come to one.
I'll also never convert a 4WD to gas again, probably because my next bus will be a turbo diesel.
FollowupID: 751901

Follow Up By: Kimba10 - Friday, Feb 03, 2012 at 14:47

Friday, Feb 03, 2012 at 14:47

Grant just checked your profile your a bit far for me lol but this is the stuff I used on my 90

FollowupID: 751919

Follow Up By: Member - Grant- Friday, Feb 03, 2012 at 17:37

Friday, Feb 03, 2012 at 17:37
Thanks for the photos gents.
I shall let you know of the outcome.
Re the Prado on LPG, it's done 100 000ks after the conversion (190 000 in total) and hasn't missed a beat until now, so I probably shouldn't complain too much. We took it up to the Cape and did the OTL in 2009, 2 adults and 3 kids on board with it very heavily loaded. I paid $17 500 for it in 2008, so pretty cheap 4WDing really.

Thanks for the offer to pick up the can of cleaner Kimba10, however probably couldn't get that one past the minister of finances...would have been a good trip though!
FollowupID: 751934

Follow Up By: snailbait (Blue mntns) - Friday, Feb 03, 2012 at 19:42

Friday, Feb 03, 2012 at 19:42
Hi all
Try the Pradopoint Forum its for prados
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