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5.3 @ 8psi. Which fuel pump?

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Old Dec 28, 2013 | 04:09 PM
  #11  
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Originally Posted by 03sierraslt
Forget the Boost a Pumps, it will kill your stock pump in short order. I am assuming you have a non flex fuel truck so get a Walbro 255, as its a easy swap. The rails are not your issue, plenty of people have made allot more power on stock rails. Get a proper pump in place and get it retuned now that you have a intercooler in place. Just don't expect too much from that MP90 as its a small compressor for a 5.3L
I have to ask since I noticed u never read that it is indeed non flex fuel. Did you notice it's a return less style system? From what I've read so far, it sounds like the return less style is tricky to swap out to an aftermarket pump. And I must add, the closest place that I know of to get it tuned is 4+ hours away. Best one I know of is about 5 hours, Wester's Garage. They have an in house dyno and I'd like to get them to tune it but I'm not ready to put too much more money into this yet. My Super Duty needs a tranny right now :s
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Old Dec 28, 2013 | 04:52 PM
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Ya I missed the non flex fuel part, yes I noticed its returnless. I have a returnless setup also and have changed pumps on both types.

I completely missed post #8. My bad.
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Old Dec 28, 2013 | 05:04 PM
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Ok thanks for clearing up the confusion. Which pump are you running on your setup and what were some tweaks required for it to work?
I really like the idea of the boost a pump but can't find too much info from users. Watching YouTube videos on various pumps w/the boost a pump right now haha
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Old Dec 28, 2013 | 05:40 PM
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Old reliable Walbro 255 will work. Swap is very simple. They will support 500-550 rwhp. Part # is gs340 I believe. Hot wire kit is also a good idea.
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Old Dec 28, 2013 | 06:13 PM
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Thanks
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Old Dec 28, 2013 | 07:22 PM
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I am moving a bit more fuel then you. I have twin pumps, different lines, standalone pump wire harness, second pump activated by Hobbs switch.

Yes the walbro # is GSS340
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Old Dec 28, 2013 | 08:12 PM
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You have ur Hobbs boost activated?
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Old Dec 28, 2013 | 09:13 PM
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Yes. A single Walbro pump will take your setup further then the MP90 will.
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Old Dec 29, 2013 | 05:32 AM
  #19  
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I kinda figured so, just didn't think it would be such a simple swap
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Old Dec 29, 2013 | 02:51 PM
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Get yourself a Racetronix drop-in 255 and hot wire kit, makes life a whole lot easier.
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