Is the Walbro making a loud whining noise? When mine started to go it was very audible and annoying after about 10 minutes of driving. My idle was rough and I was only getting 32psi at idle with stock FPR (which was a good working FPR).
I told myself if this new Walbro I bought goes bad I'm buying a Z32 TT OEM pump and be done with Walbro's for good...
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