I was about to comment that the Racor diesel fuel filter I installed on Imzadi about 16 years ago had a priming pump in the filter head. I understood that the filter head without a priming pump was primarily used for a water filter for gasoline engines (mostly outboards).
I use the smallest Racor filter on Imzadi, which is designed for 15 or 20 GPH of fuel flow IIRC. That’s about 10 times the flow rate for my 4 cylinder M35B (about 1.5 GPH including the fuel returned to the tank). So I have elected to not replace the Racor at 500 engine hours, based on the logic that 500 hours at 15 GPH is equivalent to 7500 hours of operation for my small diesel. I replaced the secondary 10 micron filter on the engine once, mostly on GPs since I use a 10 micron Racor instead of the 30 micron that most sources recommend for a primary filter. (if I had a Mitsubishi diesel, or another that used a 3 micron secondary filter, I WOULD replace it annually.) In 16 years (about 1400 engine hours) I’ve replaced a clogged Racor filter 3 times (each time within about 40 miles of taking on bad fuel). It is kind of a PITA to change the filter and reprime when I take on bad fuel, but it happens so seldom that I find that method preferable to changing the filter every year when I change the engine oil filter. When I go full time cruising, I’ll probably be changing the Racor as part of the periodic maintenance every year. Anyway, that was a long and wandering way to get to the message that the priming pump on my Racor has not had a problem in 16 tears of recreational use of the boat. Rick Brass Washington, NC From: Marek Dziedzic [mailto:dziedzi...@hotmail.com] Sent: Wednesday, October 7, 2020 1:16 PM To: Stus-List <cnc-list@cnc-list.com> Subject: Stus-List Re: water separator That option has been available for years (at least since early 90s). However, be aware that the seals on the pump tend to go bad after a while and it is hard to seal it again. I had a Racor filter like that in the past and could not stop the fuel leak there despite many tries. Eventually, I gave up on convenience and went with a filter without the pump. Marek 1994 #122 ”Legato” Ottawa, ON From: CHARLES SCHEAFFER Sent: 7 October, 2020 13:07 To: Stus-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > Cc: CNC boat owners, cnc-list <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > Subject: Stus-List Re: water separator I just checked Parker Racor and learned they now offer the R20P with a built-in hand operated priming pump and bleeder. Looks pretty cool. You can get it with a clear bowl or a metal bowl if your insurance requires that. C
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