[Healeys] Tapitty tapping of Fuel Pump

[Richard Collins]

Agree; pretty sure it’s a vapor lock. I bought some fuel line insolation to place on the lines between the two carbs as well as leading into the carbs which seemed to help once my water temp gets above 190-195,
Rumors are wooden clothes pins work as well as heat sink.
FYI Back around 2005 Gary took me in his BN7 to go look at a garage find in his Old neighborhood which turned out to be the BN7 I now have !

Regards,
Richard C
BN7 #440


On Jun 21, 2020, at 21:09, Alan Seigrist <healey.nut at gmail.com> wrote:


Hi Gary -

If you start hearing the pump run really quickly, it can be indicative of vapor lock getting back into the fuel line... can happen at the end of long trips.  It's because the fuel starts vaporizing around where the line goes into the floats, and the float jet then is no longer cutting off fuel flow because it is pushing vapor into the float bowls, which leaks out the overflow tube.  As long as your car is running it should be okay, you might use more fuel than normal.  Try wiring a piece of wood to the incoming fuel line - this is an old trick with Atlantics to act as a heat sink on hot days and stop vapor lock on the Atlantics which use mechanical fuel pumps.

Best,

Alan

On Mon, Jun 22, 2020 at 9:12 AM editorgary--- via Healeys <healeys at autox.team.net<mailto:healeys at autox.team.net>> wrote:
Yesterday I took my Healey BN& out for its first good run of the season -- 75 miles of southern Oregon backroads -- with our local Rogue Euro Car Group. Everything was terrific from start to finish. Car started on the first push of the button after sitting for six weeks, ran smoothly from start to finish, never faltered in restarts, everything nominal.

Except that, towards the end of the run on a pretty hot day (in mid 90s though the car never ran warm all day) as I was cruising along about 40 mph, the fuel pump started tapping at a high rate of speed and pretty continuously -- certain enough so I could hear it behind me. I have a standard original-spec points-style fuel pump, purchased new from Moss about 10 years ago and running without any issues every since.

Any thoughts from anyone -- could it just have been the heat? As noted, the car never missed a beat, so fuel was getting through the carbs smoothly at all times.

Anyone?

Gary Anderson

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