[Healeys] Facet Cube 12v Fuel Pump, 1/8 NPT, 2-3.5 psi | Pegasus Auto Racing Supplies
bspidell at comcast.net
Wed Feb 19 09:38:26 MST 2020
I've noticed the thermal issue as well. I attribute it to the pump's
coil--essentially the pump's body and similar to a solenoid--getting
heat-soaked and its impedance increasing so that not enough current
flows through it to pull the diaphragm back.
Or, the pump just gets an attitude when it gets hot.
On 2/19/2020 8:06 AM, John Harper wrote:
> I also encountered a SU electric pump no working when it became rather
> hot. Not only due to its own heat but that coming to it from the
> exhaust pipe on a very hot day. I have made a test rig on the same
> basis as the 'official' version. I left this pump running at the full
> flow rate for many hours but just as I was about to finish the test it
> stopped. It was quite hot running at full rate for so long. but when
> it cooled it ran fine.
> Eventually I discovered that when hot the throw over stopped working.
> This led to the discovery that the diaphragm was too 'tight'. I then
> found that later repair instruction called for more part turns before
> replacing the base. In fact two extra clamping holes.
> I have to assume that the setting was right on the edge and when the
> temperature rose the diaphragm became tighter. Since then the pump has
> been refitted to my BN1 and works fine.
> Best regards
> On Wed, 19 Feb 2020 at 15:31, Max Byers <sbyers at ec.rr.com
> <mailto:sbyers at ec.rr.com>> wrote:
> Hello, Healeyphiles!
> As part of the preparation for the cross-country drive to Lake
> Tahoe for Open Roads 2002, I added a generic electric backup fuel
> pump (P/N E8016S, from Autozone) to my BJ8 with a switch under the
> dash that allows switching to either pump, or turning both off. I
> chose to plumb the backup pump into the system in series with the
> SU because the installation was much simpler than doing it in
> parallel. That arrangement works perfectly well. Either pump can
> pump through the inactive pump. All that was required was to cut
> the hard fuel line from the SU to the carbs, which I had already
> done anyway to install an in-line fuel filter there under the RH
> rear seat. To install the backup pump then only required removing
> the filter, running new rubber fuel hoses to complete the system,
> and reinstalling the filter. Quick access to the pumps and the
> filter is done by using chrome screws from above into anchor nuts
> on the seat structure, rather than having to remove a wheel to
> access the seat stud nuts. I can remove the seat to have full
> access to both pumps, the filter, the hoses, and the wiring (it
> also makes checking and topping up the differential oil much
> easier). The backup pump is attached to the front wall of the
> boot behind the rear axle. It is quiet with only a slight hum,
> and I can’t hear it with the engine running.
> My usual practice is to run on the SU on an outbound leg of a
> trip, then switch to the backup for the return. Three times since
> doing the modification, I have had occasion to switch to the
> backup when the SU stumbled (in the middle of Atlanta traffic) and
> twice when it failed to start the car. These “failures” were only
> temporary because the SU performed just fine when switched back
> later. I have since rebuilt the SU. After Conclave in Deadwood, I
> joined the group touring the northern states, and decided to split
> off from them and make a 160-mile detour alone over into Montana
> just to check that state off my list. The weather that day was
> rainy and chilly. Just as I got into Montana on an isolated
> country road, I felt the car suddenly failing to respond to the
> accelerator. As soon as I figured out what was happening, I
> switched to the SU and kept motoring. I was able to find another
> identical generic pump at Autozone in Minot, ND the next morning
> and had it installed in about 15 minutes. I used it to get back
> to North Carolina. Easy peasy…. I was so glad not to have to rely
> on having to install a spare carried in the boot, on the side of
> the road, in the rain or in the dark.
> Steve Byers
> BJ8 Registry
> AHCA Delegate at Large
> Havelock, NC USA
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