Not really; another reference document taking the point on the industry
http://www.cleanprotectpolish.com.au...y_Check....pdf
I think regardless of the OEM filter used adding another filter will always benefit.
My point is the issue due to head loss created by the additional filter is far less serious than the issue with contaminant in the fuel itself.
Also the time taken for a pump failure due to additional head will be significantly more than the time taken for an injector damage due to contaminant.
Other thing to consider is most of the secondary filter kits are sold as 2um filters where this should be the actual filtration limit (ie OEM).
If the OEM's are actually 2um then we are adding another filter to the system to increase the efficiency anyway and also it really does not matter the additional filter is after or before the OEM (I go for before), but if the OEM is less than 2um then adding another 2um filter will improve the efficiency and remove contaminant to the required level (reason I go for before).
If the OEM filter is more than 2um then the system is doomed anyway.
Some other points from around the globe:
Filtering contamination
The precision components in todays fuel systems require specially designed fuel filters. The critical
component is a super-fine filtration media that removes more than 98 percent of particles 2 microns
and larger. Quality filters feature:
- Maximum engine performance and fuel economy
- Reduced exposure to abrasives
- Reduced wear on injectors and pumps
- Fewer fuel system adjustments
- Easier starting
- Longer filter life
KEEP IT CLEAN, AND KEEP RUNNING AT PEAK EFFICIENCY
- During storage and transfer of fuel
- Periodically drain and flush all fuel storage containers to remove any sediments.
- Maintain a regular schedule for draining machine fuel tanks: weekly for severely dusty
- conditions, every three months for normal conditions.
- Keep all fuel equipment clean.
- Maintain all hoses, gaskets and seals in your fuel storage and transfer equipment.
- Use line filters on all fuel transfer equipment.
- Never transfer fuel into open containers.
- Only purchase fuel from a reliable source, and demand periodic testing to ensure quality.
- Repair any fuel line leaks immediately.
- Keep fuel tank breathers open and functioning properly. Use an appropriate breather.
- Never operate a machine without the fuel cap.
- If a fuel cap does not seal properly, replace it immediately.
When changing filters
- Follow the recommended filter change schedule.
- Keep filters packed in their original box until they are installed.
- Never pre-fill a new filter doing so allows some fuel to bypass the filter altogether.
- Maximize filtration protection by using fuel filters of good quality.
When performing engine service
- Clean debris from the engine compartment before removing filters and other fuel system
- components.
- On earthmoving equipment use a high pressure wash to blast built-up grime off the engine
- before opening the engine for repairs.
- Tightly cap or plug all openings during repairs, even if they are only needed for a few minutes.
- Clean reusable parts with solvents, using proper cleaning and drying methods.
- Keep new parts in their original package until needed.
- Never place components directly on the ground.
- Dont reuse seals, replace them.
- Perform routine inspection of fuel line connections from the tank to the fuel pump.