Surging When Low On Fuel

[PJDXR6t]

hey guys ive noticed everytime my car is at bout tha 100km range I;e k's left...when I give it a kick in the guts it seems to surge bad as when it hits boost and jolts heaps especially when im goin round a corner fairly hard is my fuel pump dodgey or is it common prob and wats the best wat to fix it ??

[Ralph Wiggum]

hey guys ive noticed everytime my car is at bout tha 100km range i;e k's left...when i give it a kick in the guts it seems to surge bad as when it hits boost and jolts heaps especially when im goin round a corner fairly hard is my fuel pump dodgey or is it common prob and wats the best wat to fix it ??

put more fuel in if you want to belt it.....?

Edited 11/07/07 09:24 AM by hiddeous

[Paradoxx]

That is your knock sensor retarding the timing because it is leaning the engine out... put it this way when you accelerate, the fuel in your tank has to "catch up" and collect at the rear of the tank. This can mean the pickup isn't completely covered by fuel and can suck air, causing your engine to run lean. If you do this for too long watch out for the big BANG!

It happens to most cars and can be overcome by having a surge tank, but this is a fairly big job to install. Just make sure your tank is at least 1/2 full when you decide to boot it

[PJDXR6t]

ah k is this because its a turbo and when it hits boost it needs a lot more fuel ?im just not used to it as I used to drive a vt ss and when it was on a quarter of a tank u could still give it a bit of kick in the guts and still went pretty well

[O2STOCK]

Is the car modified ?

If not then the fuel pump could need replacing, as a standard car should run down to empty with out surging to this level

If it is modified and a standard pump is used then the amount of fuel left in the factory swirl pot in side the tank at low levels is not enough (Demand out strips supply). As the car accelerates (Swirl pot is at the front of the tank) fuel is pushed to the back of the tank and the pump starves for a short period, as there is not enough reserve in the stock system for the increased demand.

In this case upgrade to a surge tank.

Edited 11/07/07 10:31 AM by O2STOCK

[DAN682]

Interesting to see this thread..

This morning I needed fuel bad, I drove 40km with the car saying 0k's to empty.

I was about 2 k's from BP and the car was fully surging at 1500/2000rpm.

I got to the servo and put 60L in.

So even with 8L left the fuel was not picking up that well.

Anyway 60L got me 506km

So according to my calculations I achieved 11.8L/100KM

[aiboart]

hey guys ive noticed everytime my car is at bout tha 100km range I;e k's left...when I give it a kick in the guts it seems to surge bad as when it hits boost and jolts heaps especially when im goin round a corner fairly hard is my fuel pump dodgey or is it common prob and wats the best wat to fix it ??

I find the BAT accelerates best when fuel load is between 1/3 and 3/4 tank.

Below about 1/3 tank it seems that fuel supply and power is an issue (rather than a loss of traction).

Above 3/4 tank weight is an issue.

Regards,

aa

[XR06T]

is the car stock?

mine didn't splutter or anything for the 10 secs I booted it before it actually ran out of fuel (stupid I know) so it could be a problem with the pump!

is best to keep a 1/4 of a tank in at all times to avoid the problem.

[PJDXR6t]

its stock as a rock just got a k&n filter if ya call that a mod lol