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Hey all - looking to see if anyone has vacuum tubes for the wiper motor to the fuel pump for a model 2302 (body 2372). There were two tubes used:

398287 - fuel pump to lower hose
415735 - lower hose to upper hose

Right now, I'm just running a loooong rubber vacuum line that goes right by the exhaust. Feel like I'm asking for trouble. I THINK the lower to upper tube is still in place (second picture) - curves at the top and just runs straight down. Not sure if any of it is missing. There wasn't anything there for a lower tube.

I assume that there were short runs of rubber line used to connect the tube runs together? I've seen the upper hose with the T for the antennae switch, but I don't recall seeing how the bottom part worked - only the drawings. Would love to get this back to how it was originally setup. Thanks!

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Nothing special about them, just run of the mill standard tubing.

Probably 3/16" or 1/4".

Just buy a single piece from tubing Napa that is long enough to make both pieces from and cut the flares off the ends.

Thanks, Kev! As a curiosity, it's sort of a mystery to me how the connection worked at the pump. Does the line connect directly to the fuel pump with a flare fitting (like it does on the manifold side)? And how was the tube secured along the length of the block?

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It’s shown on p. 6 of the service manual.packardinfo.com/xoops/html/downloads/servicemanual5154/Accessories_III.pdf

And is typical of the V8 cars, of which I thoroughly explain here:packardinfo.com/xoops/html/modules/newbb ... 8299&post_id=272250#forumpost272250

This image may help too
Bob J.

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On my '54, the fuel pump's vacuum ports are push-on style. So, there would be a piece of rubber hose between the pump and the hardlines. The hardlines ends a few inches from the pump heat shield, and then a rubber vacuum hose connects that to the respective port on the pump.

The hardlines in the vacuum "system" are just there to provide structure and support so that the hoses do not sag against the engine.

Got it, guys, thank you!! The 23rd series pump appears to need a fitting of some kind at the pump, so my guess is that it was a hard line all the way. Were the horizontal and vertical segments of the tube one long tube or two distinct tubes connected by a short run of vacuum hose?

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Pumps thru 51 I believe had hard lines all the way with fittings needed at the pump. In 52 they started using some pumps with hose barbs and just connected the runs of metal tubing via short rubber hoses. I think the transition to rubber hose connections was complete by 53.

The vacuum side of the pump is placed in series between the manifold port and the wiper motor. Normally manifold vacuum is all that would ever be needed at an accessory so the way the valves in the pump are constructed, a strong manifold vacuum will always overpower the springs closing the pump valves thus keeping the valves open. Vacuum just flows thru the pump chamber which becomes essentially another section of tubing.

On those conditions such as under a heavy load or hard acceleration when manifold vacuum drops very low or goes away, the valves can close and suddenly the pump becomes the stronger source and will actually start working to supply vacuum to the wipers. Because the pump is small, the supply volume available at the wiper motor is also small in comparison to the manifold. While the wipers will still keep moving they will in almost all situations be fairly slow in comparison to the speed they would be under manifold vacuum. The pump is just there to keep them from stopping completely while manifold vacuum is low. As soon as the load is over and manifold vacuum returns in strength the pump goes back to being a pass thru again.

Here are drawings of the basic vacuum system. The engine photo shows a 22-23 manifold port location. 51-4 had the manifold port facing the rear in the box section under the carb. Something I am not completely sure of is whether the metal line fastened to the side of the block going toward the wiper motor is one or two pieces. If there is engine torque or rotation it may have needed a short rubber hose near the bellhousing to connect the engine side tube to the section of tube that goes up the firewall. I believe in some years that firewall tube is clamped near the heater box.

Thanks so much, Howard. Great information as always. I think what I've got here is the vertical section of the tube. Did my best to photograph the upper and lower parts of the vertical run. A small bend and rubber hose at the end make sense.

I suppose I could also my make my life easier still by using a couple elbow barb fittings at the pump with short rubber hose runs, then just run a long, straight run of metal tube along the engine, and connect the vertical metal tube I have to the horizontal run with a short rubber hose. That's probably notexactly how it was done, but it would still eliminate the main issue of running a rubber hose by the exhaust outlet.

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In your last picture above, that stud and nut that you see on the side of the engine is where the line attached with a little metal loop clamp.