adams355 Member 529 Member For: 6y 10m 27d Gender: Male Location: Brisbane Posted 10/08/18 01:27 PM Share Posted 10/08/18 01:27 PM So, do all the high flow pumps (walbro etc etc) get the s#its with low fuel levels? I took my stock one out which was doing pretty well on 14psi and would only 'surge' with really low fuel levels 5% etc. First, I put in a second hand walbro GSS340 def genuine, and was getting bad surge at 15% and pinging on boost, so I decided that was shot. A good deal came up for an AEM E85 340lph, so I have put that in but I'm getting surge from about 15% again, no pinging on boost, seems very smooth, slightly less noise than walbro which is good. Is this everyones experience? Happy Birthday Puff. 1 Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 16y 5m 1d Gender: Male Location: Perth Posted 10/08/18 02:27 PM Share Posted 10/08/18 02:27 PM When ever I change pumps , I get my car on the dyno to check fuel pressure and AFR. With pressure change so can fuel ratio, as you saw with the second hand pump. When I had no surge I never boosted under 1/2 tank. Now with surge I stay over 1/4. Why would you let the fuel run so low. Just fill up at 1/4...... Link to comment Share on other sites More sharing options...
adams355 Member 529 Member For: 6y 10m 27d Gender: Male Location: Brisbane Posted 10/08/18 02:58 PM Author Share Posted 10/08/18 02:58 PM Yeah I know, I just like to know when its going to do it. It will be on the dyno in a month, see how it goes. Cheers Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 16y 5m 1d Gender: Male Location: Perth Posted 10/08/18 03:11 PM Share Posted 10/08/18 03:11 PM Just remember, road conditions CAN'T be replicated on the dyno. No rearward movement of the fuel away from the pickup. Link to comment Share on other sites More sharing options...
adams355 Member 529 Member For: 6y 10m 27d Gender: Male Location: Brisbane Posted 10/08/18 03:16 PM Author Share Posted 10/08/18 03:16 PM Yep true, I will keep it over a quarter seems to be fine then. Link to comment Share on other sites More sharing options...
Puffwagon Puff Gold Donating Members 15,044 Member For: 9y 1m 28d Gender: Male Location: South Australia Posted 10/08/18 11:18 PM Share Posted 10/08/18 11:18 PM Mine got progressively worse as the power went up. At the worst it was running out at half a tank but I'm pretty sure that was before I modded the return. Link to comment Share on other sites More sharing options...
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