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Old 02-15-2015, 01:26 AM
capflya capflya is offline
Bio Brewer
 
Join Date: Apr 2010
Location: Napa, CA
Posts: 301
Definitely the return lines... I have factory hose on now and it seems to be doing well. I used some aftermarket hose and it didn't hold up well. I'm sure you can find some bio compatible aftermarket hose but I've heard good things about the factory lines.
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'98 E300 Turbo "Juliette"
'85 Federal 300TD
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