Jump to content
SAU Community

Recommended Posts

Hi guys, just looking to get a bit of advice on what state to leave my fuel tank level in.

Basically, i have my GTST as a weekend only car which means it gets driven 2-3 times over a weekend and then just sits all week.

In doing this i have basically been filling it up with enough fuel on friday to last me the weekend then leaving it empty for the week before again filling enough fuel for use on that weekend.

My rationale for this is that I know fuel can go off after a period of time reducing the octane level etc. My car is tuned quite hard and iv been instructed to only ever put BP98 in it from a reputable shop. As such i do this and only with enough fuel for that weekend's driving so i always have fresh fuel in it. If i was to fill it up completely a tank would probably last me 1-3 months and im worried that fuel in the tank for up to 3 months would be gettting shitty and perhaps causing problems (pinging etc from the fuel losing octane level).

Do people agree with this rationale or is there an alternative reason to actually be keeping the tank full? (or fuller)?. Im wondering if always having less than 20% in the tank and usually it is sitting there with <5% in the tank will be encouraging corrosion in the tank or some other problem i havent considered...?

Link to comment
https://www.sau.com.au/forums/topic/359337-should-i-leave-fuel-in-the-tank/
Share on other sites

as i mentioned above though- it would be up to 3 months that a full tank of juice would take to be used in my car. I know it wouldnt go off in 2 weeks.

also i doubt you would notice a drop off in performance even if the fuel was starting to go off. There would probably just be increased ping that you wouldnt be able to notice but would not be good on your motor. Hence my predicament...

just keep doing what you're doing, it's fine.

The only bad thing about not having a full tank is the slight risk of fuel surge when you're going hard around corners and stuff. But skylines don't get it that bad anyway, not like WRXs which'll surge if you're under 1\3 and think about going around a corner.

Went to an SAU trackday at wakie last july, last lap and the fuel light came on, loaded it on the trailer and have driven it around the block once since then.. going to chuck 10ltrs in this weekend with some octane booster i think!!

mmm, i might keep that in mind as i down have some 'favourite corners' that have me at pretty high cornering g's for perhaps 8-10secs so perhaps not the best thing if the tank is very low or even empty (fuel light on)...

does anybody know if it is one side or the other that the pump draws from? therefore will be more likely to suck air under cornering 1 way or the other...

Edited by jjman

there is no problem filling the tank and running the fuel for 1-3 months. also at say the 2 month point when it's a qtr full just top it up again. the fuel tank should have a check valve so it can breath out. the advantage of filling the tank is less air in the tank. being that the tank is under the car, and in a cool dark place with no UV or exposure to air it should last quite a long time. certainly 3 months would be no problem.

the other problem with running the tank low is it concentrates all the dirt/silt etc that is in the tank into such a small quantity of fuel and can cause contamination.

mm, food for thought on the contrary arguement. Might go for keeping it at at least over a 1/4 tank for the driving phase n also making sure i dont leave it too empty in the weekly garage time.

cheers again peeps :)

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Yeh I think i'll message an old contact i had for ages that manages his own tyre shop now.. n tell him what i want n work with him before ordering..  Got this 17x9 +30 Driftteks on 245/45/17 PSR Drag Radials on the rear.. They fit well - for your reference in future - Rear guards  have been lipped in & minimal to non flaring of the rear Gaurds.    
    • If only it were that easy! I also needed to remove seats, shocks, brake calipers, send my car through a fence, and use measuring and ended up guessing because I didn't remove seats, shocks and brake calipers. It can be hard sometimes Can be a little more complex than 'just measure' if you want to truly measure the entire wheel through all of it's suspension travel. But if you aren't going for every last mm then yeah, you can check the space you currently have and guesstimate.
    • If you own a car, and it has wheels on it, and you know the offset of those wheels, and you have a measuring device, you have everything you need to work out if other wheels will fit.
    • Will this fit? but they are staggered set - RAYS 57DR SEMI GLOSS BLACK 18x8.5 +37 | 18x9.5 +38 5-114.3 STAGGERED SET   or If no go could just get a set 4's wheels of 18x8.5 +37 5-114.3 - would i run 8.5's 235s up front n 245's at the back if I do?   Thanks.        
    • Put a clamp on your return line. I have a feeling it's sucking air, and introducing bubbles to your fuel. With a lot of fuel, less problematic. I'd honestly be redoing all the lines in the tank and clamps on everything.   Also, you've given two different answers to the same question: Asked if being followed by the police you could get down to use the whole tank, you said yes you could, so long as you keep off boost. However, you then followed this up that free revving, it would also cause the issues. I'm doubting free revving is enough to make any noticeable boost on what is likely a decent sized turbo.   So now I have to ask, can you actually drive it lightly and use all the fuel, or does it break up even free revving? Also, have you put a fuel pressure gauge on it? Can you hear the pump change noise at all when you're having this issue?
×
×
  • Create New...