Vacuum gauge for VO & #2 fuel restriction? - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 01-28-2009, 10:01 AM Thread Starter
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Vacuum gauge for VO & #2 fuel restriction?

For those who have a vacuum gauge to monitor VO & #2 fuel filter restriction, how much difference of a vacuum reading do you see at idle and at 55 mph? You know the filter is clogged when the high vacuum reading is at idle or at 55 mph? How many inches of vacuum indicate to you to change the filter?

I realize the Super Duty fuel systems run on pressure, but the OBS is a vacuum system. I just installed a vac gauge in the cab to monitor fuel restriction. On VO there is 2" of vacuum at idle and 2" at 55 mph. On #2 I see about 2" at idle and about 7-8" at 55 mph with brand new filters so I think there may be a restriction in the #2 fuel supply line. The VO lines are 3/8" ID hose throughout. The diesel supply has 3/8" hose too but also the smaller steel line that runs under the truck. Normally there should be more vacuum on VO but that's not the case. I used compressed air and blew the diesel steel line clean but after a test drive the vacuum reading at 55 mph was still 7-8". So if I were to get 3/8" hose throughout the diesel side will the vac reading at 55 mph be like the VO reading of 2" at 55 mph since all filters are new, the VO is hot, and both have the same 3/8" ID supply lines?

So if it's normal for the vacuum to rise as you go faster why is my VO reading so much lower than my #2 reading?

1997 F-350 7.3L PSD - 326K miles - 40+K on VO - Plant Drive Kit
1984 Mercedes 300D NA - 160K miles - 10+K on VO - Custom Two Tank
Running on VO and biodiesel since May 2006
Without oil you're nowhere!
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post #2 of 4 Old 02-06-2009, 07:13 PM
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I have about 2" vac at idle and at 55mph with hot oil. It will draw more vac with colder oil buy drops as the oil heats up. The diesel side will show 0" vac both with new clean filters. As the filter loads up with contaminants it will start to pull more vac especially on hard acceleration. When the vac is steady at 15" at a steady 55mph is when its time to change the filter. I've noticed when the vac starts to climb, it won't take much more than 75 to 100 miles before I have to change the filter.

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post #3 of 4 Old 02-06-2009, 08:54 PM
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how is this plumbed in? pictures?


-
Quote:
Remember, we aren't eating this stuff, we're turning it into diesel fuel. Your truck only cares about viscosity, acidity, and BTUs. Nothing else. -unknown?
Quote:
NC State law defines biodiesel as ''any fuel or mixture of fuels derived in whole or in part from agricultural products or animal fats or wastes from these products or fats.''
Exemptions from the excise tax
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post #4 of 4 Old 02-25-2009, 08:45 AM Thread Starter
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Quote:
Originally Posted by hheynow View Post
So if it's normal for the vacuum to rise as you go faster why is my VO reading so much lower than my #2 reading?
Because the VO side has a looped return. I love answering my own questions.

1997 F-350 7.3L PSD - 326K miles - 40+K on VO - Plant Drive Kit
1984 Mercedes 300D NA - 160K miles - 10+K on VO - Custom Two Tank
Running on VO and biodiesel since May 2006
Without oil you're nowhere!
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