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Old 01-03-2012, 01:38 PM   #1
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Location: Irvine, CA
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M54 > Fuel Filter > Vacuum Hose question

I have a question regarding the vacuum line on the front of the fuel filter:

What does it do exactly? I just recently replaced my fuel filter and noticed that this line is a bit weathered.

I had rough cold idle before, but I just got my codes pulled and am seeing low-fuel / random misfires. (P0300, P0313) + P1619(tstat error)

I just checked spark plugs 1 and 2, they look healthy, my next step is using fuel injector cleaner.
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Old 01-03-2012, 01:50 PM   #2
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I have to reference my old pix but I believed the vacuum line that from the fuel pressure regulator connects to the fuel rail (toward the firewall) or somewhere toward the back of the intake manifold (toward firewall).

good luck. when I get a chance I will try to search for the pix
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Old 01-03-2012, 03:55 PM   #3
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Yep, the vacuum line is for the fuel pressure regulator that is integrated into the fuel filter.
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Old 01-03-2012, 04:03 PM   #4
Mark M
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It connects to the top of the intake boot. The small vacuum F pipe.
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Old 06-08-2012, 11:36 AM   #5
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I need to know a part number for this hose.. the soft part that connects to the F connector broke off and I was getting lean codes.
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