603 Primer / Lift Pump Rebuild Kit? - PeachParts Mercedes-Benz Forum

Diesel911 · #1 01-01-2012, 06:52 PM

I think we all have a bubble in our Plastic Primary Filters. As long as the Air is not being pulled into the Fuel Injection Pump the Bubble is not an issue.

If you have no Hand Primer on your Fuel Supply/Lift Pump there should be no source of Air leak in the Fuel Supply Pump. This means any Air Leaks would be down stream from the Fuel Supply Lift Pump.

Also if you have no Hand Primer you Fuel Injection Pump is setup to allow small amounts of Air out of the Fuel Injection Pump Housing by way of the Fuel Pressure Relief/Overflow Valve.

However, In the DIY section there is some instuctions on how to rebuild the older and newer Fuel Supply/Lift Pumps.
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sasquatchgeoff · #2 01-01-2012, 07:22 PM

Quote:

Originally Posted by Diesel911

I think we all have a bubble in our Plastic Primary Filters. As long as the Air is not being pulled into the Fuel Injection Pump the Bubble is not an issue.

If you have no Hand Primer on your Fuel Supply/Lift Pump there should be no source of Air leak in the Fuel Supply Pump. This means any Air Leaks would be down stream from the Fuel Supply Lift Pump.

Also if you have no Hand Primer you Fuel Injection Pump is setup to allow small amounts of Air out of the Fuel Injection Pump Housing by way of the Fuel Pressure Relief/Overflow Valve.

However, In the DIY section there is some instuctions on how to rebuild the older and newer Fuel Supply/Lift Pumps.
DIY Repair Links
DIY Links by Parts Category - PeachParts Mercedes ShopForum

PeachPartsWiki: Do It Yourself Articles - Mercedes Vehicles

yeah - what he said. No manual primer on the 60x.xxx series engines - "self priming." - my air ingress was AFTER the lift pump as the IP pulled on the secondary filter - many arguments about how this is possible later, I can now confirm that it is indeed possible, but that matter is a little off topic - In this case the air in the primary seems to be the tell-tale issue.

I ended up replacing every rubber line in the fuel delivery circuit. The hard lines back to the tank were not stopped up, but had accumulated paraffin as a result of biodiesel usage stripping the build-up on the walls of the tank to the bottom. I disconnected the rubber connectors and forced compressed air through the hard lines. Big gobs of black goo spattered the underside after a big "thunk" from the pressure build up. Very small bubble in my primary now.