Packard Forum Index » Pre-War (1899-1942)

hello, there are no lines installed on my mechanical fuel pump from the 1937 8-cylinder.
an electric pump was installed.
I want to convert this back to the original mechanical pump.
how and where are the lines connected? I have a charter carburetor.

thanks Mike

You can look at the factory renderings of your 282 motor on this site. Use the Packard decoder menu and use X115403 as an engine number. You will see in the image it is pretty simple. Not shown is the steel line that comes from the tank into the engine compartment on the passenger/righthand side and it has a rubber gas line at its end that will fasten to the rearward port fitting on the pump. Illustrated you can see where there is then a steel line that runs from the forward fitting up to the carburetor.

My fuel pump died today on my '37 115c. Rebuild kit on the way. The pump installed appears to be a correct style AC dual action pump, but the wipers are not connected to the fuel pump/vacuum pump.

Can someone chime in on what this connection looks like? I assume that the line connects to one of the threaded ports on the upper section of the assembly. A previous owner connected the vacuum line to the intake manifold. Wipers have never worked; rotted hoses under the dash were removed to cure a massive vacuum leak.

The vacuum section of the pump is connected in series with the wiper motor. Wiper motor connects to the pump inlet side and manifold port connects to the pump outlet port. I don't know exactly where the supply port is located on the 37 manifold but there should be a dedicated port. Later engines had them on the manifold at the top front or rear or under the carb and there could be more than one. Most wiper only ports are 1/8" pipe size. Some carbs also have a vacuum port for the wipers at the bottom in the throttle plate casting.

1/4" steel tubing runs from the manifold (or carb) and wiper motor to the pump. Pump connections depend on the pump. Some have threaded ports that need fittings to connect the tubing directly and other pumps have hose barb type nipples and use a short length of vacuum hose to connect to the metal tubing going to the manifold and wiper motor.

Normal manifold vacuum will be stronger and in much greater volume than the pump will produce so the springs in the valves in the pump are overcome and valves are held open. Pump basically acts as a pass thru and diaphragm just goes thru the motion with nothing it can do. When manifold vacuum drops due to load or a wide open throttle down below what the pump can do the valves will then be able to close and pump takes over but at a reduced volume which is enough to keep the wipers moving but usually at a slower speed.

Interesting--thanks. Right now, there is a line from the manifold to a rubber line, that then goes through the firewall to the wiper assembly. Wipers haven't ever worked, and there was an enormous vacuum leak under the dash due to swollen and corroded hoses. I've just disconnected the whole thing and plugged the line for now. Yet another bastardized "repair" on the car to figure out.

In addition to getting the vacuum lines and pump plumbing sorted, due to the age the wiper motor internal seals and gaskets may be dried out. You will probably find it necessary to have the wiper motor rebuiltrebuildingtricowipers.com before wipers will work satisfactorily.

Almost certainly the case, HH.