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High Flow Fuel Pumps


adams355

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  • Member For: 6y 10m 27d
  • Gender: Male
  • Location: Brisbane

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.

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  • Dropping a turd
  • Gold Donating Members
  • Member For: 16y 5m 1d
  • Gender: Male
  • Location: Perth

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......

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  • Dropping a turd
  • Gold Donating Members
  • Member For: 16y 5m 1d
  • Gender: Male
  • Location: Perth

Just remember, road conditions CAN'T be replicated on the dyno. No rearward movement of the fuel away from the pickup.

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  • Puff
  • Gold Donating Members
  • Member For: 9y 1m 28d
  • Gender: Male
  • Location: South Australia

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. 

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