B
brydon@icarus.ssd.loral.com
Wed, Apr 25, 2001 5:38 AM
At 13:09 -0700 4/20/01, Garrett Lambert wrote:
The most convenient location for me to install fuel line vacuum gauges is
either just before or just after the primary filters. Does that work?
Cheers, Garrett
Garrett,
You want to put the vacuum gauge AFTER the filter in question, so
that as the filter becomes clogged, your fuel pump pulls a vacuum,
indicated by the gauge. Some things to consider:
-
The engine (cam) driven pump that pulls the fuel thru the primary
filters and pushes it thru the secondary filters. It supplies about
7 psi to the injector pump. It is a diaphragm pump and as a result
creates a pulsation on the vacuum gauge. To remedy this the gauge
should be a liquid filled gauge to damp out the pulsation in the
mechanism, or the gauge will beat it self to death. Ordinary gauges
(about $7 ea from Grainger) will work for a while, but at some point
it's going to fail, and may start letting air leak in to the fuel
system. I found some perfect gauges at: http://www.gaugestore.com
Look for the P/N 9691957 Wika Vacuum Gauge 30-0 "Hg $13.07/ea.
-
Have a small in-line ball valve to seal off the gauge were it to
spring a leak and start allowing air to be pulled in to the line
(about $5 ea from Grainger).
-
If you're concerned about the secondary filter(s), you may also
want to add a damped 0-15 psi pressure gauge after the secondary
filter.
Hope this helps,
-Louis
SEASTAR - '69 American Marine Defever Alaskan 46-018
Redwood City, California, USA, Terra, Sol, Milkyway
At 13:09 -0700 4/20/01, Garrett Lambert wrote:
>The most convenient location for me to install fuel line vacuum gauges is
>either just before or just after the primary filters. Does that work?
>
>Cheers, Garrett
Garrett,
You want to put the vacuum gauge AFTER the filter in question, so
that as the filter becomes clogged, your fuel pump pulls a vacuum,
indicated by the gauge. Some things to consider:
1) The engine (cam) driven pump that pulls the fuel thru the primary
filters and pushes it thru the secondary filters. It supplies about
7 psi to the injector pump. It is a diaphragm pump and as a result
creates a pulsation on the vacuum gauge. To remedy this the gauge
should be a liquid filled gauge to damp out the pulsation in the
mechanism, or the gauge will beat it self to death. Ordinary gauges
(about $7 ea from Grainger) will work for a while, but at some point
it's going to fail, and may start letting air leak in to the fuel
system. I found some perfect gauges at: http://www.gaugestore.com
Look for the P/N 9691957 Wika Vacuum Gauge 30-0 "Hg $13.07/ea.
2) Have a small in-line ball valve to seal off the gauge were it to
spring a leak and start allowing air to be pulled in to the line
(about $5 ea from Grainger).
3) If you're concerned about the secondary filter(s), you may also
want to add a damped 0-15 psi pressure gauge after the secondary
filter.
Hope this helps,
-Louis
SEASTAR - '69 American Marine Defever Alaskan 46-018
Redwood City, California, USA, Terra, Sol, Milkyway
