Hiflow diesel

Submitted: Sunday, Jan 09, 2022 at 14:16
ThreadID: 143070 Views:5857 Replies:9 FollowUps:5
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I have an RG Colorado cab/chassis tray back.
The OE fuel filler neck will not accept a high flow bowser nozzle as it'stoo small in dia.
I know some makes do, can anyone tell me if they've found and used a larger diameter filler neck, what vehicle it came from and if there were dramas adapting hose sizes to the fuel tank neck please.
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Reply By: outlaw40 - Sunday, Jan 09, 2022 at 15:11

Sunday, Jan 09, 2022 at 15:11
try this https://shop.browndavis.com.au/product/holden-colorado-fast-fill-filler-neck-2012-present
AnswerID: 639038

Reply By: Kazza055 - Sunday, Jan 09, 2022 at 15:35

Sunday, Jan 09, 2022 at 15:35
My 2014 D-Max will take the fast flow (larger diameter) nozzle so maybe you can get one from a wrecker.
AnswerID: 639039

Follow Up By: RMD - Sunday, Jan 09, 2022 at 19:33

Sunday, Jan 09, 2022 at 19:33
Is it possible GM have, as they often do, change original designs of components and fitted a different tank, tank entry and smaller filler size. It is $$$$$'s after all. I just suspect it to be possible and until proven wrong I will go with that possibility.
FollowupID: 917917

Follow Up By: Kazza055 - Sunday, Jan 09, 2022 at 19:39

Sunday, Jan 09, 2022 at 19:39
In the back of my mind I think I recall reading about this problem about the time I was shopping for my D-Max way back in 2013-2014 days.

Maybe contact the spare parts and see if they have another filler.

FollowupID: 917918

Reply By: Bushranger1 - Sunday, Jan 09, 2022 at 15:46

Sunday, Jan 09, 2022 at 15:46
G'day Peter,
My 2016 DMax Cab/Chassis accepts the larger highflow diesel nozzle BUT the auto cut off on the pump just trips out the pump all the time.
Guess the fuel just can't get down the pipe & into the tank fast enough. Just because the larger nozzle fits I cannot use it anyway.
I just use the standard diesel nozzle & it works fine.

AnswerID: 639040

Follow Up By: Kazza055 - Sunday, Jan 09, 2022 at 16:36

Sunday, Jan 09, 2022 at 16:36
Being a Cab/Chassis, you possibly have a different neck as I have no problems with filling mine at the fastest rate.
FollowupID: 917915

Reply By: RMD - Sunday, Jan 09, 2022 at 16:38

Sunday, Jan 09, 2022 at 16:38
All very nice to refuel race car fast, but the size of the entry tube into the tank dictates the actual flow rate AND if the breather system cannot exhale fast enough through it's small size venting, the fuel will constipate in the neck and blow back or shut off nozzle anyway. Maybe look at the related components/ possibilities before you spend money on a mod which might work or may not. To fill faster you might need a vacuum source sucking the air out of the tank, all for a couple of minutes saved! To Blat the fuel in might take a few mods , not just one. It possibly isn't just a matter of changing the nozzle receival size!
Design and bean counting often means sufficient to fill ok but maybe not fast.

Hi Flow for truck tanks with 3" hole to squirt through is normal, Even in large tubes to 1000L tank in a bus/coaches the fast flow can be too much because of length and venting speed. Truck wash removes the blowback from clothes!
AnswerID: 639041

Reply By: Member - nickb boab - Sunday, Jan 09, 2022 at 21:37

Sunday, Jan 09, 2022 at 21:37
High flow at my local shell/coles servo's is maybe not large truck std but is pretty fast delivered through the std size nozzle
But in my experience tray top utes are the worst for fuel flow to tank
Cheers Nick b

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AnswerID: 639043

Reply By: Member - McLaren3030 - Monday, Jan 10, 2022 at 08:37

Monday, Jan 10, 2022 at 08:37
Hi Guys,

Something to consider when using “Hi Flow” pumps is that because of the high flow rate, there is a higher “foaming” rate also. Even when using “Premium/Special” Diesel containing an anti foaming agent, the fuel will still foam up to a certain extent. The higher the flow, the greater the foaming. So whilst you may save some time using a hi flow pump, if you truely want a “full” tank, you then need to “trickle” fill at the end to get the last 4 or 5 litres into the tank. So, how much time have you really saved?

In my case, 275 Litres (long range plus standard tank), it will take around 9 minutes to “fill” my tank, even using the high flow pump.


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AnswerID: 639048

Reply By: Peter 1953 - Monday, Jan 10, 2022 at 10:58

Monday, Jan 10, 2022 at 10:58
Thanks for the replies...
My issue is, that at remote fueling points most have hiflow bowsers only and my vehicle won't accept the nozzles. Most remote towns/settlements have quite reasonably priced diesel at unmanned truck fuel points and with a bit of forward planning regarding refuelling quite a considerable amount of money can be saved.
We just returned from 25000km trip and I calculate by utilising my long range tank and cheaper fuel sources I saved $500-$600 on the trip.
AnswerID: 639051

Follow Up By: Member - shane r1 - Tuesday, Jan 11, 2022 at 08:19

Tuesday, Jan 11, 2022 at 08:19
I get that being some place that only has the larger diam pump nozzle being a problem, not necessarily the speed of fill, just being able to fill is good !
So yes I’d be changing the filler neck for sure .
Pay particular attention to the breather, getting the air out is critical to good flow .
Even if the fitting at the tank is smallish go to larger diameter hose from there on will help a lot. I’ve modified a few fuel fillers on tray tops that I mounted other equipment around that area, definitely found the breather to be critical.
Good luck hope you find a good solution
Cheers Robbo
FollowupID: 917941

Reply By: Member - Scrubby (VIC) - Monday, Jan 10, 2022 at 20:36

Monday, Jan 10, 2022 at 20:36
G`Day Peter,
Not really to do with the diameter of the filler pipe but I had many problems trying to fill the standard fuel tank on my 2011 D-Max when I first got it , replaced the filler pipe, altered the position of the breather pipe outlet, raised the filler point, etc . After seeing a bloke filling the same model vehicle with the Bowser Nozzle inserted into the filler pipe upside down and reducing the flow when nearly full, I have used this method and not had a problem since.

AnswerID: 639055

Reply By: 1296 - Tuesday, Jan 11, 2022 at 18:21

Tuesday, Jan 11, 2022 at 18:21
2018 Hilux takes a high flow nozzle, no issues what so ever??
AnswerID: 639063

Follow Up By: RMD - Tuesday, Jan 11, 2022 at 19:54

Tuesday, Jan 11, 2022 at 19:54
Wow! How does that help the op?
FollowupID: 917956

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