What does el feed mean on my fds comet super 11/110 pressure washer

Comet is a company that makes high pressure washer pumps. Usually sold by northern tool

L'utiliser cette pompe sans huile est une erreur fatale:

[PDF]COMET PLUNGER PUMP SERVICE MANUAL INDEX

www.cometpump.com/_images/support/Pump_Repair_Manual.pdfLUBRICATION: Make sure crankcase is filled with Comet Pump oil. Running this pump without oil will cause damage and void any warranties. Change the pump ..

You have to take off the pump head. Here is the link to the service for comet pumps.

https://www.pwmall.com/PDF/CometServiceManual.pdf

check your check valves.
or one of the wobble plate pistons is not working right ( broken, broken spring etc)

I think install right angle elbow then short tube upwards,install the breather to this.

You should use what the pump manufacturer recommends. Typically a 30wt non-detergent (non foaming) oil. Do not over fill. If there is a sight glass half way is normal. Or if it has a dip stick follow the mark there.
Here is a great link for pressure washer parts and info
This link goes right to oil page:
http://pressure-washer-parts.com/shopdisplayproducts.asp?Search=Yes

Hi this could be the oil and pump seals worn. Also make sure that you don,t have the transit plug in or the pump cannot breath. It should have a air vented dipstick.

You need to adjust the nozzle on the end of the lance so the machine will draw chemical at low pressure.

This is a Help forum but you should be able to find a service dealer from Comet. Here is a link to their web site. LINK

aftermarket oil will be fine just use same grade of oil,all manufacturers want that extra kick,