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does my FPR need to be hooked up to vaccum?
hello! I just had a dual pump system installed in my car noticed once it was installed the gauge on the fuel pressure regulator does not read and the needle just flicks around. I noticed that there seems to be a line that needs be hooked up to a vaccum line but my mechanic says that is only for port injection cars he says the gauge is wrong? Just want a second opinion
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