FG50T Member 568 Member For: 20y 9m 6d Gender: Male Location: Melbourne Posted 21/07/11 06:55 PM Share Posted 21/07/11 06:55 PM You'll have to excuse me because I've never felt fuel surging so I can only assume. OK I'll start off my mentioning I had my car tuned 3 days ago (Bosch 42lb injectors), all clamps under the bay are tight, boost solenoid is clean. At 2000rpm with a bit of load on the throttle the car surges as it comes on boost and the revs fluctuate between 2000-2500 for a few seconds and the turbo can be heard pausing in between spooling up. At first I thought it was a tune fault as it did it on the way home 1/2 tank of fuel at 100 when I nudged it a bit to overtake (5th gear D mode). It also started doing it at 60 today if you make it drop down a gear to 2500rpm area. The car behaved like this only once in standard form some time ago accelerating to 60 a few times but am unsure if I was low on fuel on that night.I filled up a full tank and the problem could only be felt about very slightly (wouldn't have noticed if I didn't have my eye on the tacho) then I nailed it going up a hill and it stopped revving at 3000rpm like it had a rev limiter there? Could it possibly surge like that with a full tank of fuel? Link to comment Share on other sites More sharing options...
micheal Member 69 Member For: 16y 3m 1d Posted 21/07/11 11:52 PM Share Posted 21/07/11 11:52 PM Have u changrd fuel filter latly? Link to comment Share on other sites More sharing options...
Adam Here since the start... Lifetime Members 10,282 Member For: 21y 6m 25d Gender: Male Location: Victoria Posted 22/07/11 12:02 AM Share Posted 22/07/11 12:02 AM Doubt it's fuel surge on a full tank or at 2000rpm.Does the dyno sheet have a dip in the power at those revs? Link to comment Share on other sites More sharing options...
ratter Member 6,793 Member For: 18y 5m 23d Gender: Male Location: @ my laptop Posted 22/07/11 12:47 AM Share Posted 22/07/11 12:47 AM Is this the FG we tuned earlier this week?Any car issues may show up worse after the car has been tuned and really should have been rectified before tuning, or at least mentioned at the time, we have had some customers think a tune will solve all their issues, in some cases it may put a band aid fix on it but the real problem needs to be addressed.The car may need to go back to the tuner, whether it was us or who ever tuned it, to be looked at, explain to them exactly how you can reproduce the problem to make it easier to diagnose/repair.Another thing to possibly so is to fit the stock injectors and flash the stock tune back into it to see if the problem is there stock and then go back to the tune and injectors.Fuel surge does not normally happen with a fuel tank, unless the pump is not keeping up (faulty) Link to comment Share on other sites More sharing options...
Worm A much better forum Silver Donating Members 3,808 Member For: 16y 3m 28d Gender: Male Location: Victoria Posted 22/07/11 12:51 AM Share Posted 22/07/11 12:51 AM Plugs or coils? Link to comment Share on other sites More sharing options...
FG50T Member 568 Member For: 20y 9m 6d Gender: Male Location: Melbourne Posted 22/07/11 01:30 AM Author Share Posted 22/07/11 01:30 AM Fuel filter has been done also, it has 24,000kms so I doubt spark plugs/coils but will check nevertheless. Yes Mick it's me from Monday, I rang up yesterday and left a message with Bel. Pre-tune it only occurred once in a less excessive form a few months ago probably around March? The fact that the issue lessened with a full tank is weird though...I'll keep troubleshooting and pop in when you have time available Mick. Link to comment Share on other sites More sharing options...
ratter Member 6,793 Member For: 18y 5m 23d Gender: Male Location: @ my laptop Posted 22/07/11 01:34 AM Share Posted 22/07/11 01:34 AM (edited) Hi JoeWe have seen 1 FG that the fuel pump failed, not die completely but just started to get less flow to where the car would surge etc, but the fuel level should make no difference to this.If the fuel level is affecting things it sounds like fuel surge, but there are other things that may give similar feel.It may pay to pull the pump out of the tank and make sure there is no splits etc in the pick up hose and the pump is picking up from the bottom of the tank, either of these could explain fuel surge. Edited 22/07/11 01:34 AM by ratter Link to comment Share on other sites More sharing options...
FG50T Member 568 Member For: 20y 9m 6d Gender: Male Location: Melbourne Posted 22/07/11 01:51 AM Author Share Posted 22/07/11 01:51 AM (edited) Will do it when the fuel level gets low again Mick thanks. Any insight on why the car cut at 3000rpm on the hill? Maybe it is the pump, I've always been able to hear the fuel swishing in the tank at anything under 15L remaining don't know if that's normal in a Falcon. Edited 22/07/11 01:57 AM by FG50T Link to comment Share on other sites More sharing options...
Adam Here since the start... Lifetime Members 10,282 Member For: 21y 6m 25d Gender: Male Location: Victoria Posted 22/07/11 02:51 AM Share Posted 22/07/11 02:51 AM God! Your hearing must be good! Link to comment Share on other sites More sharing options...
ratter Member 6,793 Member For: 18y 5m 23d Gender: Male Location: @ my laptop Posted 22/07/11 04:06 AM Share Posted 22/07/11 04:06 AM again I'm totally guessing, but the angle and possible pick up problem may have contributed to it????There could be other explanations to your problem that are not fuel related, but if the tank level is causing it change that's what needs to be looked at first Link to comment Share on other sites More sharing options...
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