Hi guys and gals! Just wanted to put this out there, for both informational purposes and to inquire if anyone has been down this path and has any advice for me. Btw I have a 2014 MT RS w/ approx 30k miles and around 15k while tuned.
I have an aftermarket walbro fuel pump installed in my Juke by 2J Racing. Ever since I got the pump and had it tuned I get a hesitation and stalling episode, once in a long while. Not often. Seems to happen when it's >90 degrees, have less than 1/2 tank of gas and if idling for a long time and/or lots of stop and go traffic. Then it throws fuel pressure related codes. After the car cools down for about 30-60min it runs fine like nothing ever happened.
When recently speaking with Joe at 2J he mentioned that since the walbro pump sucks more fuel at a faster rate that the canister can get depleted which doesn't give the pump the fuel it needs. He recommends drilling two 3/8" holes at the bottom of the canister to help keep the canister filled with fuel. Told me he doesn't know if they drilled the holes for my Juke (probably not). Here is the how to video he told me to watch - https://www.facebook.com/Joe2JRacing...24925?sfnsw=cl
BUT I ASK WHY??? So then....doing some research online revealed many forum threads about ppl discussing the lack of a venturi suction effect when swapping their OEM pumps to the Walbro pumps. I don't fully understand it yet but in the middle of researching and learning. Joe's solution is to drill holes at the bottom of the canister which helps to keep gas around the bottom of the upright pump. However some ppl wrote about causes for concern where air can be introduced into the canister as the fuel sloshes around in the tank. That is the reason why there aren't any holes in the canister to begin with. So I am not sure if I should actually do this mod. I hope it doesn't solve one problem and create another? Seems like 2J drills holes in the canister on all the Jukes he tunes now (I assume).
Lastly 2J advised I cannot/should not go back to an OEM pump because the tune requires a higher flow rate, and in going back to OEM I can risk engine detonation and failure running lean.
I would think the OEM pump flows within 10% of the walbro and therefore many of you are tuned without an aftermarket pump. We probably don't need the walbro pump until we are pushing 350whp or more.
Any thoughts / suggestions are welcome! :-)