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Pre filling fuel filters

Yahoo Message Number: 7142
Well I guess to those who wait shall come the reward. I finally received the following response about prefilling fuel filters. It confirms my thought of it just being a contamination problem. I do now accept and will conform to the idea of not doing it. There was much concern on ther part about the E-mail having not been answered. I think the concern was genuine.

The following is reproduced in it's entirety for your enjoyment.

Summary: rv isc 350 O&M fuel, prefilling fltrs

James - "thanks for your patience. Again, we have no idea what may have happened to your earlier emails.... but let's take it from here.
The reason we stopped the practice of pre-filling fuel filters is to eliminate one more possible contamination opportunity for debris, dirt or whatever to find it's way into the precision (tight tolerances) fuel system components on todays high-pressure electronic fuel systems .... systems which are built to much tighter specs and are far more sensitive to contamination.

As we've progressed from mechanical systems to the newer electronic ones with higher pressure, the impact of fuel contamination has greatly increased. This is somewhat compounded by the fact that rotary-type pumps on some of our engines also rely on the fuel for pump and fuel system component lubrication (the older inline mechanical pumps were either closed self-lubrication, or received lube oil from the engine's oil system).

Therefore, for engines such as yours, we specify installing the filters "dry" and then operation the electric lift pump for a sufficient period of time to self-fill the filters. In the case of the ISC with the Cummins CAPS fuel system, the Operation & Maintenance Manual, page 15-4 (for the one we have) says, "The ISC has a self-priming, low pressure system that purges the air from the fuel system. There is no need to prefill the new filter with fuel."

There are also precautions about cleaning around the filter before it's removal. We trust that you were provided the O&M Manual with the coach, otherwise the dealer or previous owner owes you the ones we provide with our engines.

There are several Cummins manuals available for the ISC engine. You can purchase them by calling 1-800-DIESELS and selecting the 'literature' option or calling 1-800-345-5654 or email cecoteam@...
You will be connected to Gannett Direct Marketing in Louisville, KY.
They handle all of Cummins literature and will take your order with credit card info.

When you call, here are the bulletins that are available:

Bulletin No.

ISC Operation & maintenance          3666262 ISC Parts Catalog             3672137

ISC Fuel System Troubleshooting and Repair    3666271 ISC Base Engine Troubleshooting and Repair   3666245 C series shop manual            3666008

C series Alternative repair          3666109
We thank you for your interest in Cummins products. Please let us know if you need assistance in locating the nearest Cummins-authorized Dealer or Distributor Service Provider. For assistance in locating a Service Provider, feel free to use Cummins North America Dealer Locator, which can be found on Cummins website:
http://www.cummins.com/service_locator/index.cfm
Please let us know if you have other questions and if away from your computer or have a time-critical request that needs more urgent attention, feel free to call us toll-free (from North America) at
1-800-DIESELS (343-7357). Customers may also call Cummins switchboard
1-812-377-5000 (worldwide toll call) and ask for the 800-DIESELS
Call Center for assistance.

Email direct: powermaster@...
Regards,

-- Powermaster Customer Assistance Center Cummins, Inc. Columbus, Indiana, USA"