Can I put the 61x style lift pump primer pump on a 603? - PeachParts Mercedes-Benz Forum

777funk · #1 10-30-2007, 11:03 AM

I changed my fuel filters a couple days ago and I had to crank for quite a bit (I've got a Flat plate heat exchanger for a WVO diesel Blend in between my lift pump and secondary fuel filter).

Is there a way to put the lift pump from a 61x engine on my 603's IP? I loved that primer pump. I hate it that the 603 Lift pump doesn't have one.

Is there any easy mod or swap of parts to get a primer/lift pump?

dieseldiehard · #2 10-30-2007, 11:56 AM

The 603 has no place for the manual pump, it uses the rotating IP shaft to prime and yes its very slow to get primed if there is any air in the fuel lines. That also put a lot of wear on the starter motor

You can however pressurize the fuel tank just 1 psi will force fuel into the filter, that is something I have not had to do (yet).
You should probably figure a way to fill that heat exchanger, and of course the spin on filter if changed must be filled with fuel or Moly Diesel Klean stuff before putting it on

oldiesel · #3 10-30-2007, 08:42 PM

you can easily install an inexpensive electric fuel pump inline with a separate switch, the easiest and quickest way to get the air out of any fuel system.When you change filters just switch it on,at first it will rapidly while it fills the filters and sends the air back thru the return line then when the air is gone the clicking will slow down alot.Then you are ready to start no fuss no mess.When you have air because you have run the system out of fuel you will still have to loosen the injector lines and crank the engine to get the air out of them but your cranking time will be greatly reduced. My $.02 Don

Brian Carlton · #4 10-30-2007, 11:36 PM

Quote:

Originally Posted by oldiesel

.When you have air because you have run the system out of fuel you will still have to loosen the injector lines and crank the engine to get the air out of them but your cranking time will be greatly reduced. My $.02 Don

What's interesting about this procedure is that some engines require it and some don't.

My SD doesn't care whether you crack the injector lines or not. It starts in 12 seconds after the lines have been removed and reinstalled. However, other 617 engines will never start with air in the hard lines to the injectors. I'm theorizing that the condition of the injection pump must be relevant. With very tight pistons and elements, the air can be forced through the system..........otherwise it cannot.

Hit Man X · #5 10-31-2007, 01:04 AM

Quote:

Originally Posted by 777funk

I changed my fuel filters a couple days ago and I had to crank for quite a bit (I've got a Flat plate heat exchanger for a WVO diesel Blend in between my lift pump and secondary fuel filter).

Is there a way to put the lift pump from a 61x engine on my 603's IP? I loved that primer pump. I hate it that the 603 Lift pump doesn't have one.

Is there any easy mod or swap of parts to get a primer/lift pump?

Did you prefill the spin-on? Also, put your foot to the floor if you haven't tried that...

pawoSD · #6 10-31-2007, 01:10 AM

Both of our SD's start after about 12-15 seconds of cranking if you have removed the hard lines...

When I did my fuel filter last, I cheated. I did it with the engine warm, so even though the secondary had almost no fuel in it, I cranked, it fired up with the fuel that was already in the IP/hard lines, and I gunned it, it made it to about 3000rpm, began slowing very quickly.....fell to almost idle speed, then caught and rev'd back up. Now thats purging!