LED lighting, soundproof, Sailor's Solutions Inc.      

Vacuum Monitoring of Diesel Fuel Systems

      

Vacuum gauges and alarm switches, shown above, are used to monitor your diesel fuel system, including the filter element. As the element becomes clogged, fuel flow becomes more restricted resulting an increase in vacuum on the engine side of the fuel filter.

A vacuum gauge can be used for more than just checking the condition of your fuel filter. Many variables in your fuel system will affect the readings on your gauge. Here are some examples:

Some possible causes for
high readings:

Some possible causes for
low readings:
  • Dirty Primary fuel filter
  • High density filter media being used (2 micron filter cartridge. 30 micron is recommended)
  • The use of a fuel strainer on the pick up tube in the tank
  • Undersized fuel Lines
  • Fuel valves not fully open
  • Blocked fuel tank venting kinked hose or
    insects in the overboard screen (check your Fire Extinguisher Hose ends weekly)
  • Fuel hose inner liner collapsed
  • New secondary fuel filter
  • Lower fuel level in tanks
  • Fuel Gelling (very cold temp.)
  • Dirty secondary fuel filter
  • High level of fuel in tanks
  • Worn fuel pump
  • New Primary filter
Other Tips:
  • Readings should be taken at cruising RPM or higher while under load. The drag point feature really comes in handy because it remembers the maximum vacuum.
  • Some engines use the fuel flow in the system for cooling of the injectors and pump. Even though the engine is running well, you might have a improper fuel flow. Check with your engine dealer.
  • Most Diesel engines use a mechanical fuel pump (lift pump), which will cause the needle to vibrate. Dash mounted (hose run dampens) and gauges with a restricter will also dampen this effect. With the proper valves it can also be used to check for any leaks in the suction side of the system.
Find our vacuum products in our Engine Room.

Click here for Racor marine filter information.
product<br>image
No-OX-ID A Special Electrical Grade Conductive Grease and Contact Lubricant
Use on all electrical contacts to prevent corrosion. Rated number one by "Practical Sailor" Dec. 2010
$12.95
product<br>image
Volt Minder 12 VDC System Monitor with mounting bracket
Add a voltage monitor inexpensively to your Nav. Station Wow! a 2-decimal place readout with a low voltage alarm & backlight
$44.95
product<br>image
Signal Mate 2NM LED Tri-Color & 2NM Anchor with Wind Indicator Illumination Includes mounting bracket
Compact and rugged Designed for many years of operation Made in USA
On Sale through February. MSRP $351.00, Now $285.00!
$285.00
product<br>image
Automatic Loading Multi-bit Screw Driver will make you the feel like Matt Dillon! Works like a pump gun!
Loads and chambers a bit from its magazine/ handle. You never touch the bit!
$19.95
product<br>image
Coolnet Sailboat Hammock - Unique 3-point design sets up fast and stores easily
If you want a really nice place to lounge or sit you need this hammock! that you can rig in a few minutes
$169.99
product<br>image
Portable LED cockpit and anchor light with daylight sensor and cigarette lighter plug
Be safe - Light up your cockpit and keep an extra anchor light on board Doubles as a cockpit/ utiltiy light
$34.95
product<br>image
CrewLight™ Flashlight - 4 Duracell® batteries included

The ultra bright pocket light!
"Toughest and Brightest" - Practical Sailor

$19.95
product<br>image
WiFi SignalMaker™ Onboard WIFi hi-gain amplifier and base station
Make your WiFi fast and reliable with our 9 dB hi-gain base station
$399.95

Go to top of page.