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My sonoma is originally a 4.3 so im gonna have to change fuel system with vette filter for my LS1. My question is will a stock flex fuel pump fit in the original sending unit or do i have to go a different route? I also here about a walbro 225???
 

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SweetS10V8 did a flex sending unit. I don't think it was exactly a drop in affair though.

The Walbro kit for a 4th gen F-body is said to fit the late model S10 just fine.

I used the Racetronics kit for a Typhoon on my Blazer. The kit is a 100% bolt in/plug and play for a 1st gen.
 

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I used the 2.2 flex Fuel Pump also...The only issue I had was the connectors not matching up..But after some searching I found the correct connector and everything works just fine.
 
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