Quote:
Originally Posted by 280SE1972
Hello, I am new to this forum and just bought a barely running 1972 280SE (6cyl). While replacing all the fuel lines I came across a very weird situation. ...
Rich
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In general, it's best to start a thread unique to your problem.
Having said that, the fuel pump outside the tank is designed to deliver a lot of fuel at low pressure. It does not have a pressure bypass to route fuel back to the tank or to receive it from the engine compartment.
The system is designed to keep the fuel moving through the plumbing and not stick around in any one place too long to get hot.
It is possible that somebody got confused between the 280SE and 280SE 3.5 or 4.5 (both are V8s) setup, which is a high pressure pump with a return line.
If your fuel pump is working correctly, it will delivery about 4 liters per minute of fuel at about 15psi. Measure that with a 1 liter container in a 15 second span. If the volume delivered is too low, check that the voltage at the pump is at least 9 volts (low voltage == low fuel delivery on a DC pump).
Common problems with the fuel pump, other than old age and varnish may be fine rust particles clogging it up.
Best to figure out if the pump is good or bad and move on from there. A poorly adjusted fuel distributor (also called a pump) under the hood is more often the culprit. Try not to make it worse.
-CTH
10-14-2025, 10:48 PM
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