Re: 1953 Packard-Correct connection of the fuel pump.
Posted by HH56 On 2023/6/26 13:41:19
Not exactly sure what you mean by MAN terminal?? If you are going exclusively to a mechanical pump there is nothing electrical involved so any damaged wiring associated with the old pump could be eliminated. If you plan on keeping the electric pump then depending on what type pump and how much pressure out it provides, possibly it could be reinstalled near the fuel tank for emergency and priming use if the car sits a long time between drives.
No idea how much of your original system is still present since you said the old pump was removed. There are a few fittings you will need. Normally those just transfer from one pump to another but if missing they, or something that will work, can be purchased -- although it may be more difficult to find US thread sizes in metric countries.
The small hose in the bottom photo is the connection between the end of the metal line coming from the fuel tank that is visible near the bottom right side of radiator. One end of the hose connects to the metal tube end and the other end of the hose goes to a 90 degree fitting on the inlet port of the fuel pump. The outlet side of the pump connects to a fitting and a longish curved metal tube that goes up to the carb and optional filter. On 51-2 pumps there is an air chamber also connected to the port on the outlet side of the pump. Later cars eliminated the air chamber but the hole may still be present so there must be a plug in any extra opening.
The upper half or vacuum side of the fuel pump is in series between the manifold and wiper motor. Most of the time the vacuum pump does nothing and will just work as an inline connection or pass thru for the steel vacuum lines. If manifold vacuum drops when the engine is under load or at full throttle then it comes into play providing enough vacuum to keep the wiper motor moving slowly.
To plumb it in there will be a metal tube from a port on the manifold just below the base of the carburetor. If the car has power brakes it will be a tee connection with a check valve and large hose going to the brakes. A smaller opening will connect to a steel tube which drops down and bends to head forward toward the fuel pump. Non power brakes just have a fitting and the small opening with the tube heading toward the pump. A few inches from the fuel pump the metal tube stops and a short length of rubber hose connects to the end of the metal tube and goes to a port on the fuel pump. It should have something like OUT as a label or if no marks, just move the pump arm and it will be the port where you feel air exiting. For the other tube to the wiper motor, when you move the arm you will feel suction at the IN port.
Another short length of hose connects the IN or vacuum port of the pump to another metal tube which heads back toward the firewall and wiper motor. A final short rubber hose connects the end of that tube to the inlet port on the passenger side of the wiper motor..
On the 53 wiper motor the port on front pointing downward is a vent and not used for anything else. The upper port on the drivers side is for the optional windshield washer used on 48 thru 53 cars. On those you turn the wiper control knob backwards and hold it against a spring for a few seconds which allows vacuum to connect to that port to operate the washer. In 54 (possibly sometime in late 53) Packard started using an optional washer that was electrically activated and connected to constant vacuum so that port was not used on those systems.
Here is a bit from the parts manual showing basics of the fuel pump layout. If you need something showing more details on the vacuum side tubing I can put something together and post it later.
Attach file:
fuel pump and tubing.jpg (218.25 KB)
No idea how much of your original system is still present since you said the old pump was removed. There are a few fittings you will need. Normally those just transfer from one pump to another but if missing they, or something that will work, can be purchased -- although it may be more difficult to find US thread sizes in metric countries.
The small hose in the bottom photo is the connection between the end of the metal line coming from the fuel tank that is visible near the bottom right side of radiator. One end of the hose connects to the metal tube end and the other end of the hose goes to a 90 degree fitting on the inlet port of the fuel pump. The outlet side of the pump connects to a fitting and a longish curved metal tube that goes up to the carb and optional filter. On 51-2 pumps there is an air chamber also connected to the port on the outlet side of the pump. Later cars eliminated the air chamber but the hole may still be present so there must be a plug in any extra opening.
The upper half or vacuum side of the fuel pump is in series between the manifold and wiper motor. Most of the time the vacuum pump does nothing and will just work as an inline connection or pass thru for the steel vacuum lines. If manifold vacuum drops when the engine is under load or at full throttle then it comes into play providing enough vacuum to keep the wiper motor moving slowly.
To plumb it in there will be a metal tube from a port on the manifold just below the base of the carburetor. If the car has power brakes it will be a tee connection with a check valve and large hose going to the brakes. A smaller opening will connect to a steel tube which drops down and bends to head forward toward the fuel pump. Non power brakes just have a fitting and the small opening with the tube heading toward the pump. A few inches from the fuel pump the metal tube stops and a short length of rubber hose connects to the end of the metal tube and goes to a port on the fuel pump. It should have something like OUT as a label or if no marks, just move the pump arm and it will be the port where you feel air exiting. For the other tube to the wiper motor, when you move the arm you will feel suction at the IN port.
Another short length of hose connects the IN or vacuum port of the pump to another metal tube which heads back toward the firewall and wiper motor. A final short rubber hose connects the end of that tube to the inlet port on the passenger side of the wiper motor..
On the 53 wiper motor the port on front pointing downward is a vent and not used for anything else. The upper port on the drivers side is for the optional windshield washer used on 48 thru 53 cars. On those you turn the wiper control knob backwards and hold it against a spring for a few seconds which allows vacuum to connect to that port to operate the washer. In 54 (possibly sometime in late 53) Packard started using an optional washer that was electrically activated and connected to constant vacuum so that port was not used on those systems.
Here is a bit from the parts manual showing basics of the fuel pump layout. If you need something showing more details on the vacuum side tubing I can put something together and post it later.
Attach file:
fuel pump and tubing.jpg (218.25 KB)
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