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 > _______________________________________________ > > 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!
_______________________________________________ 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!
