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#1
02-06-2007, 09:13 AM
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Primer Pump on 603 from 87 300d
Hi guys,
Does the 603 have a fuel primer pump like the 617 does? I don't see one so I assume not. If I'm right, how do you purge the lines when you change the fuel filters? Just loosen the lines on the injectors and crank the engine or what? Seems like a pain vs. just pumping fuel through the new filters with an Easy to reach hand pump as on the 617. Just wondering... I'm buying a 603 equiped vehicle and curious. Thanks, Nick
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-E300d '99 350k -Suburban '93 220k -TDI Jetta '03 350k Sold -F250 '96 7.3 -Dodge Ram 12V -E320 '95 200k -E320 Wagon 1994 155k -300d Turbo '87 187k miles -E320 1994 200k -300d Turbo '84 245k (sold to Dan62) -300d Turbo '84 180k -300sd '80 300k -7.3 Powerstroke Diesel 15P Van 500k+ miles -190d '89 Non Turbo 2.5 5cyl 240k (my first MB) Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's. 
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#3
02-06-2007, 10:29 AM
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You are correct, the 603 is "self-priming". This means you just crank and crank and eventually it primes itself. But this is hard on the battery & starter.
Here is what I do: fill the fuel filter with fuel before installing. Then pull the fuel hose that supplies the injection pump. Attach a vacuum pump to this hose and suck the fuel all the way to that point. Re-attach the hose to the IP and crank until the car starts. This minimizes the amount of cranking you have to do, and only involves loosening one hose.
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1987 Mercedes 300D ~200K (Greasecar & Biodiesel) 1993 Ford F-250 7.3 IDI diesel 165K (Biodiesel) 1996 Thomas/International Bus with DT466 engine 
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#4
02-06-2007, 11:06 AM
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Its self bleeding, turn the key and crank.
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2016 Corvette Stingray 2LT 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#5
02-06-2007, 11:23 AM
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Fill the metal can filter with clean diesel or a diesel additive. And when you turn on the engine push the pedal to the floor. That way more fuel will be sent and youll fill up the filters quickly and push out all the air without having to crank the engine over and over for it to self prime.
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Current: 05 E320 CDI 07 GL320 CDI 08 Sprinter 05 Dodge Cummins 01 Dodge Cummins Previous 2004 E55 AMG 2002 C32 AMG (#2) 1995 E300 1978 300D 1987 300D 2002 C32 AMG(blown motor :[ 1981 300SD 1983 300SD 1987 300SDL 2002 Jetta TDI 1996 S420 1995 S500 1993 190E 2.6 1992 190E 2.3 1985 190E 2.3 5-Speed
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