I just went through similar symptoms and fixed it by changing the O-ring gasket 
on the primary fuel filter cover 

Dan Grant 
Puffin
1970  corvette #148
Ipswich Ma 
Sent from my iPhone

> On Jun 25, 2017, at 8:31 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
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