Miller Posted July 5, 2007 Report Share Posted July 5, 2007 I just put one into my 5.0 and I have a question: The car is running odd under acceleration and backfiring. Will the car Need a tune? Tune itself out? Have a bad pump and am I going to have to beat this guys ass? Thank you Quote Link to comment Share on other sites More sharing options...
Vander Posted July 5, 2007 Report Share Posted July 5, 2007 I have a walbro 255 in my car, can you describe a little more what it is doing under acceleration? Quote Link to comment Share on other sites More sharing options...
1Quik7 Posted July 5, 2007 Report Share Posted July 5, 2007 might wanna check the voltage and the f. pressure. Quote Link to comment Share on other sites More sharing options...
Miller Posted July 5, 2007 Author Report Share Posted July 5, 2007 It'snot making power under acceleration. How can I check the voltage Steve? I'll check the pressure in a little bit. Quote Link to comment Share on other sites More sharing options...
V8 Beast Posted July 5, 2007 Report Share Posted July 5, 2007 same injectors? Quote Link to comment Share on other sites More sharing options...
lawnman Posted July 6, 2007 Report Share Posted July 6, 2007 I switched from a stock fuel pump to that one and had no changes in acceleration . I did change the computer and injectors though. Did you change the sock ? Quote Link to comment Share on other sites More sharing options...
Miller Posted July 6, 2007 Author Report Share Posted July 6, 2007 Sock? The little orange thingy or the plug? Quote Link to comment Share on other sites More sharing options...
Stimmel1647545512 Posted July 6, 2007 Report Share Posted July 6, 2007 Miller my I just installed a brand new bbk (warlbo)255 pump in my car hasn't come off the jack stands but have had it up to 6k rpm a few times and took it through first gear no change, in anything so far it was oddly quiet tho, the fuel pump that is and my top end is bone stock(for now). Quote Link to comment Share on other sites More sharing options...
Miller Posted July 6, 2007 Author Report Share Posted July 6, 2007 I'm not quite bone stock though, I asked my dad and he told me how to check out the voltage. I'll be doing that and seeing what I can do with the fuel pressure tomorrow so I can make it to QS&L Saturday. Quote Link to comment Share on other sites More sharing options...
Buckeye1647545503 Posted July 6, 2007 Report Share Posted July 6, 2007 did you have to wire it in or was it plug and play? maybe got pos and neg switched? Quote Link to comment Share on other sites More sharing options...
kep91tsi Posted July 6, 2007 Report Share Posted July 6, 2007 Walbro 255 flows more fuel than stock fuel pump any injectors any computer fuel pressure regulator is still over run. If the fpr is over run it cause problems in your fuel rail turulence etc. The fuel pump is flowing all the fuel it can rewired, used with rewire kit as plug and play, whatever the gph is still higher than stock there fore your fpr can not return or regulate the fuel fast enough. My expierence with this problem on 4 banger turbo are bad idle running straight rich, backfire and plethora of other wierd events, from all of my research I have been told to ad fpr and turn fuel on regulator back to stock for me it has worked and has explained alot of tuning issues. Hope this helps or brings up more disscusion would like to know. Quote Link to comment Share on other sites More sharing options...
Stimmel1647545512 Posted July 6, 2007 Report Share Posted July 6, 2007 Miller, I know your car is not "stock" just giving my two cents with the pump, I also have a bbk regulator to match that im gonna be hooking up when I do my cobra intake or whatever I use soon. Quote Link to comment Share on other sites More sharing options...
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