Gu patrol petrol 4500

Submitted: Thursday, Mar 07, 2019 at 17:42
ThreadID: 137910 Views:798 Replies:4 FollowUps:2
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Would putting new factor fuel pump and o2 sensor help improve fuel economy We are planning a trip to Cape York about 10,000 klm next year would keep old one for spares any ideas would be appreciated
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Reply By: nickb - Thursday, Mar 07, 2019 at 17:49

Thursday, Mar 07, 2019 at 17:49
Only if the old ones are faulty or out of spec. What is your current fuel consumption?
AnswerID: 624269

Follow Up By: Member - Philip L4 - Thursday, Mar 07, 2019 at 18:21

Thursday, Mar 07, 2019 at 18:21
About 18 / 100 vehicle is 21 yrs old always maintained but close to 2900 klgs fully loaded
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FollowupID: 897752

Reply By: Member - Philip L4 - Thursday, Mar 07, 2019 at 18:19

Thursday, Mar 07, 2019 at 18:19
About 18 to 100
AnswerID: 624272

Follow Up By: nickb - Thursday, Mar 07, 2019 at 19:41

Thursday, Mar 07, 2019 at 19:41
I had 2 4.5 GUs (auto and manual), the best I ever got was 16L/ 100km on a highway run. Both of mine had lift kits, bigger tyres, roof racks etc and my average on petrol was similar to yours. I ran both of them on LPG and never got much better that 23L/100km.

I reckon you won’t get much better, they are just an old technology thirsty petrol motor.
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Reply By: Gusthebus - Thursday, Mar 07, 2019 at 18:51

Thursday, Mar 07, 2019 at 18:51
Just back from 6mths 25k km in4.2 diesel gu. If pumps fine leave it. We got about 15l 100km can give exact if want. Was pushing gvm on departure. Best fuel reduction was lighter aerodynamic and slower. Bot in that order. The diff btw 100 and 90kph is significant and saved time irrelevant.
AnswerID: 624273

Reply By: RMD - Thursday, Mar 07, 2019 at 20:53

Thursday, Mar 07, 2019 at 20:53
I agree with nickb, only if faulty or o2 is out of spec. You would need a tech device to read it’s small voltage output to the ecu to check. I remember you had trouble and suggested a valve clearance check because that makes the intake and exhaust gasses in synch with each other and will have a beneficial effect if all correct. Ensuring the ignition timing is set to the fuel to be used is also good. A new fuel pump is a sound thing to carry as a spare but if the original is working properly then it has not bearing on consumption.
The fuel injectors may be spraying squirts moreso than a fine spray. Possibly a dose of injector cleaner may assist in restoring their performance.
I replaced the head on one a year ago, but can’t remember what the front pulley is like. If the front pulley on this can move it’s outer rim and timing has been done to that instead of the actual piston position, then it may be running retarded although a normal timing check says it is correct. You need an informed mechanic to make sure all is well there.
AnswerID: 624277

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