Here's the situation. A vacuum gauge is installed in the fuel output hose immediately after the primary fuel filter. It is located between the primary fuel filter and the secondary filter. Can this vacuum gauge determine if in addition to the primary fuel filter, the secondary fuel filter or if both are nearly clogged?
Fuel Vacuum Gauge
- Thread starter sailboatracer
- Start date
Answer is NO.
Pressure at any point in the fuel line, requires a knowledge of fuel flow rate.
Here is the science.
https://en.wikipedia.org/wiki/Bernoulli's_principle
Jim...
Pressure at any point in the fuel line, requires a knowledge of fuel flow rate.
Here is the science.
https://en.wikipedia.org/wiki/Bernoulli's_principle
Jim...
Concur with James that the answer is no. To explain it differently - Any restriction in the secondary filter reduces the flow through that filter. That wouldn’t cause any extra suction in the line between the filters. The only vacuum between the filters would be attributed to restriction in the primary filter.
That is a indicator of "clogging" only if you read it at approximately the same engine conditions such as...
1) RPM
2) Engine Temperature
3) Fuel tank level
4) Fuel pump health
However you can use a vacuum gauge to monitor the slow clogging of a fuel filter, over a long time.
If your gauge changes fast, you have a serious problem.
Jim...
PS: Note the Yellow band
PSS: the need for a second filter is rare on most modern marine diesels
WOW ! You guys operate at a much higher level than my pay scale.
I find the fuel flow rate is so low on a Yanmar 2GM20F, I forget all of the viscosity, engine loading, and lift pump details and see that when the engine is running, the vacuum is always a big goose egg (as far as the gauge will show).
The filter inlet isolation valve must be throttled in quite a bit before a vacuum starts to form.
And as everyone else says, the condition of the secondary filter does not affect the reading on the the vacuum gauge. To determine the condition of the filter you are concerned with, a vacuum gauge must be installed "downstream" of that particular gauge.
I find the fuel flow rate is so low on a Yanmar 2GM20F, I forget all of the viscosity, engine loading, and lift pump details and see that when the engine is running, the vacuum is always a big goose egg (as far as the gauge will show).
The filter inlet isolation valve must be throttled in quite a bit before a vacuum starts to form.
And as everyone else says, the condition of the secondary filter does not affect the reading on the the vacuum gauge. To determine the condition of the filter you are concerned with, a vacuum gauge must be installed "downstream" of that particular gauge.
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Not really, but I do like my Racor Vacuum gauge[ pict above] that has a marker or set point to see changes.
mine.
Jim...
Well, obviously we travel in different financial circles.
All I could afford was this cheap gauge without the marker.
However, it IS a compound gauge. Unfortunately, not many people are impressed with that fact
.
All I could afford was this cheap gauge without the marker.
However, it IS a compound gauge. Unfortunately, not many people are impressed with that fact
.
Yeah, yeah. Very pretty
!But of far greater interest, what is the blue device with the long piece of flat bar attached to it ? Looks interesting.
That holds his dead engine in his not Sailing boat.
Jim...
Ya figure he's a powerboater posing as a sailboater
?Almost got myself kicked off here for a lot less than that
!
Please note the @jssailem did not deny what I said.
Diesel mechanic to John's rescue on Aug 2nd.
Praying for John's Diesel engine now.
Jim...
PS: John is praying for mine that has not been run in 18 months.
OMG I had not realized John's diesel had passed . I'll light a candle for it this Sunday
. I hope the diesel witch doctor can breath some life back into it without John passing out from the price of repairs.What seems to be the problem with yours ? Is there a pox on diesel engines now ? First Monkeypox, now Dieselpox. Oh, the humanity of it all
!
I just talked with @jssailem and there no good news to report for his enginePraying for John's Diesel engine now.[]
On to the next issues of Sailing...
Jim...
PS: John said he felt like he just had a "Gut Punch" and now browsing for a new engine.
PSS: At least he got his transmission off the boat with a smile.
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I was absolutely bowled over when I saw him holding his Xmission at arm's length seemingly with no other support
.Then I saw the lines at the end of the boom
.
Sorry to hear of your loss. Have you posted before on it's problems or care to reveal the final blow.I just talked with @jssailem and there no good news to report for his engine
I said the same to him about using his Boom to make that lift.
I saw a youtube on fixing his Perkins Marine Diesel 4107 that the transmission weighs ≈100 lbs
John said his weighs ≈220 lbs.
I said good idea with Boom Lift, but not so good where all that weight pushes on his mast.
His smiles for success without loosing more of his hair.
Jim...
PS: I am Sure John will post more on his dilemma.
PSS: My engine has not been turned over now for 1.5
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I prefer this setup for lifting out my engine.I said the same to him about using his Boom to make that lift.
I saw a youtube on fixing his Perkins Marine Diesel 4107 that the transmission weighs ≈100 lbs
John said his weighs ≈220 lbs.
I said good idea with Boom Lift, but not so good where all that weight pushes on his mast.
His smiles for success without loosing more of his hair.
Jim...
PS: I am Sure John will post more on his dilemma.
PSS: My engine has not been turned over now for 1.5 hrs so hopefully I will bump start it next week to make sure oil is pumping.
