Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 14, 2025 ...

As I have written before I am very pleased with my change to a Parker/Racor 790R30 and I would recommend you do the same.

I have a few questions regarding this fuel filter topic relative to an issue that's developed while doing filter maintenance this week.  I've had this typical maintenance done at a shop. Attempting to learn how to take care of this "beast" myself.

The current setup has a Donaldson P550691filter as the primary.

2-  If the "new" Donaldson P550691 filter hangs up and cannot be easily snugged up then tightened, I will assume the mandrel base threads have an issue. Does this filter look like a WIX base? No number on the base unfortunately... Any ideas on how/where to get a replacement base, (is there a check valve in the base?). Did the wrong filter get installed on it???

Jeff,

That filter base looks more like a filter base for a hyd. log splitter that was put on as a get by.  If the new filter you have ordered don't spin on with ease that leads me to think that either the center mount threads are damaged or that the filter has the wrong threads for the filter base.  In either case I would replace it so service can be done without fretting  as you don't need to have to order a special fuel filter if you are in a bind.  If you pick up a bad load of fuel you want to be able to change filters setting on the side of the road without a lot of trouble as you will be fit to be tied at this point.  The location of the filter is great of ease of access though.

 If I was changing out filter bases I would get one that a replacement filter could be gotten at most any parts store or truck stop even though I carry a spare set of filters. The Racor 790R30 with the clear bowl (90 GPH flow) or the Davco 382 (180GPH flow) would either be a good replacement. If you went with the smaller  Davco 243 with 60 GPH flow would be starving the M-11 IMHO. You can pick up a used Davco off eBay or out of a truck wrecking yard and give it a good cleaning with new filter for about half price of a new one in the box so shop around.

Mike

I thought the Racor has a built in pump? Auto?

Anyone have any experience  with the Racor 490R30 unit?  It's the exact same filter and flow rate as the electric prime model 790R30, but has the manual prime botton. Might save me from mounting the control box and bringing over a fused 12v line.

Jeff,

Unless it is a misprint on the Parker Racor website, the manual model ports are 3/8" while the ones on the electric model are 7/8" and, are different style.  You will want to make sure the manual model is not restrictive-- sorry, I am not conversant on comparing actual ID of the two styles.

http://ph.parker.com/us/en/diesel-fuel-filter-spin-on/490r30

http://ph.parker.com/us/en/spin-on-filter-pump-systems/790r30-12v-dc-pump

#490R30 Port Size: 3/8"-18 NPTF (SAE J476)

#790R30 Port Size: 7/8"-14 UNF

Wow, good catch Brett.  I spoke with the Racor Tech Support Rep. this afternoon, he indicated they were virtually the same model and use the same filter media, other than than of course  manual push button prime verse electric prime.  I put another call in for the Tech Support Rep. to clarify the documentation.  If the ports are that much smaller, I agree it would be a restrictive flow rate.

Jeff