My experience suggested 4 likely culprits; Racor o-ring, Racor gasket, rough sealing surface on the top of the Racor body and bowed cover for the Racor.
Put the Racor cover on a flat surface or use a straight edge across the cover. If it is "dished" downward, it may not be sealing well. If you want to pin it down quickly, temporarily bypass the Racor with a jumper line with a cheap inline filter in it. If the problem persists, look elsewhere. Dennis C. Touche' 35-1 #83 Mandeville, LA On Sun, Jun 25, 2017 at 7:31 PM, Charlie Nelson via CnC-List < cnc-list@cnc-list.com> wrote: > > My Beta 28 fuel system has recently developed a penchant for sucking air > into the system somewhere upstream of my electric fuel pumps. (I have 2 > installed in parallel so that I can switch between them if one dies or get > clogged, etc.) > > These pumps are downstream of my Racor 500 30 micron fuel filter/water > separator. The input to the separator goes directly to the pickup tube > assembly on the top of my fuel tank via a diesel fuel hose secured with > hose-clamps--recently installed. (I motored at flank speed for about 8 > hours after the installation without any issues). The tank pickup tube > assembly looks identical to a Moeller Fuel pick-up tube which mounts to the > tank top and has nylon tube which goes straight down into the tank about 12 > inches. > > Something is allowing air to get in since my engine will stall frequently > but randomly. On the first occurrence, I changed both the engine and the > Racor filter. > > When it happened again within an hour of the filter change, I opened the > system at the input to the engine filter and found either frothy fuel (lots > of bubbles in it) or just an empty hose. Since the filters had just been > changed, I figured it had to be a vacuum leak. (I was able to pump fuel > into the line and get the engine started again each time it happened--over > the course of a full day of motoring I would guess that it happened on > average every 1/2 hour). > > I tightened all the clamps and the Racor seal as much as I dared and this > did not prevent the stalls. > > My mechanic is as mystified as I am but will likely check-out/replace both > the Racor entirely and the fuel-pick-up tube. The pick-up tube is original > which makes it about 22 years old. > > My thoughts are the Racor filter or vacuum gauge seals are bad/scored or > just not seated properly OR the pickup tube assembly is leaking at the tank > seal or the nylon tube itself has developed small holes or cracks that > allow air to enter, especially with my fuel pump sucking fuel more > efficiently than was possible with the mechanical pump on the engine (since > bypassed). > > My questions to the list are--am I missing something else that could cause > this? Has anyone else had similar vacuum issues and what was the > cause/solution? > > Thanks, > > Charlie Nelson > Water Phantom > 1995 C&C 36 XL/kcb > > > cenel...@aol.com > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > >
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