From Mobil‘s website
Colour of petrol grades is not regulated, however, the typical colours used in industry are:
- Unleaded 91 & E10 Unleaded - Red or Orange
- Premium 95 - Yellow
- Premium 98 - Yellow
Occasionally, you may notice that the colour of the fuel is different to that which you are familiar with. This alone is not cause for concern as occasionally the fuel may have been left undyed or a higher octane grade downgraded.
Find out about the most frequently asked questions on our Petrol, Octane ratings, Ethanol, Diesel & Biodiesel fuels here. Get all your answers about Mobil fuels now!
www.mobil.com.au
Other websites, say undyed diesel is amber green whIch slowly darkens as it ages…
Again, fuel colour isn’t standardised across Australia and depends on the fuel manufacturer as to what/how they want to market their stuff…
As for the VF tank, you won’t be able to fully empty it because it’s a saddle tank design that is split into two sections than straddles the driveshaft. Other makers install a small transfer pump with a small management module to ensure the fuel is moved from one side to the side where the high pressure fuel pump that feeds the engine lives.. Guess Holden took the cheaper approach using some clever vortex suction principles (but emptying a tank completely using the fuel pump isn’t a great idea if there is rubbish within the fuel that can then block the internal filter).
As for running better, but not 100%, what did the fuel look like? Fill up a clear 1 or 2 litre bottle and let is sit for a few hours and then shine a light through it and have a look. Does it seem to be stratified (different fluids floating on top of each other)? Good fuels won’t be stratified. Does it have little particles floating in it? Good fuels won’t have particles floating within that will block your filter…
Post a pick of a clear see through 1 or 2 ltr bottle full of fuel taken from your tank. Just curious.
Note that sometimes the contamination can be really hard to spot as it’s miscible with the fuel and won’t separate. This is what happened to me as the fuel was clean and clear but crud was very visible on the injector tips themselves (one which was completely blocked). The crud was easily dissolved using isopropyl alcohol. So I cleaned the injectors by soaking them in isopropyl alcohol then used a 9V battery and some pressure can carb cleaner to squirt through an opened injector (short bursts of open so I didn’t burn the injector winding). Worked a treat. Mind you it was really easy to pull the injectors on my 4cylinder shitbox whereas doing the same on a Holden V6 is a PITA from what I gather.
