Primer Pump

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Primer Pump

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Mercedes Forums >> Mercedes Benz Models >> Diesel Discussions >> Primer Pump

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Primer Pump - 5/18/2008 6:51:38 AM

benzman83

Posts: 8
Joined: 5/18/2008
Status: offline

I have gained much info on this forum now I need a question answered please about my 83 300D. My primer pump is leaking. How do you go about repairing it or removing it. Is there a repair kit. Thanks

Post #: 1

RE: Primer Pump - 5/18/2008 7:01:31 AM

ForcedInduction

Posts: 864
Joined: 5/20/2006
From: Federal Heights, Colorado
Status: offline

Its easy. Unscrew it from the pump base and screw on the new one. There are several on eBay, search there for "Mercedes primer".

Do not get the old style with the plastic knob, get the updated style.

Old style:

New style:

_____________________________

1980 240D 3.0VNT 222K Miles. OM617.95, GT2256V VNT turbo, 4-speed manual, 3.46 diff, 15mm rear swaybar, ALDA removed, no EGR and Amsoil by-pass oil filter. Currently 107HP and 195lb/ft of torque at the wheels.

www.youtube.com/Turbo617

(in reply to benzman83)

Post #: 2

RE: Primer Pump - 5/21/2008 7:22:02 AM

paddo

Posts: 42
Joined: 12/20/2007
Status: offline

I read recently that the new style is not suitable for veggie oil and other thicker fuels.

(in reply to ForcedInduction)

Post #: 3

RE: Primer Pump - 5/21/2008 2:16:26 PM

ForcedInduction

Posts: 864
Joined: 5/20/2006
From: Federal Heights, Colorado
Status: offline

Whoever told you that was wrong. Let me guess, Mercedes$ource?

_____________________________

1980 240D 3.0VNT 222K Miles. OM617.95, GT2256V VNT turbo, 4-speed manual, 3.46 diff, 15mm rear swaybar, ALDA removed, no EGR and Amsoil by-pass oil filter. Currently 107HP and 195lb/ft of torque at the wheels.

www.youtube.com/Turbo617

(in reply to paddo)

Post #: 4

RE: Primer Pump - 5/21/2008 11:18:10 PM

paddo

Posts: 42
Joined: 12/20/2007
Status: offline

It was dieselgiant.com - I just checked. the old style is also quite a lot cheaper. I like the way it can be locked down also (mine leaks a bit when pumping but not when screwed down), not sure if the new version can do that.

(in reply to ForcedInduction)

Post #: 5

RE: Primer Pump - 5/22/2008 4:16:38 AM

ForcedInduction

Posts: 864
Joined: 5/20/2006
From: Federal Heights, Colorado
Status: offline

Being able to lock down has no real function other than personal preference.

The new version is spring return so all you have to do is push it.

quote:

mine leaks a bit when pumping but not when screwed down

That means its bad. If fuel can leak out, air can leak in.

_____________________________

1980 240D 3.0VNT 222K Miles. OM617.95, GT2256V VNT turbo, 4-speed manual, 3.46 diff, 15mm rear swaybar, ALDA removed, no EGR and Amsoil by-pass oil filter. Currently 107HP and 195lb/ft of torque at the wheels.

www.youtube.com/Turbo617

(in reply to paddo)

Post #: 6

RE: Primer Pump - 5/22/2008 10:27:23 AM

paddo

Posts: 42
Joined: 12/20/2007
Status: offline

quote:

ORIGINAL: ForcedInduction

Being able to lock down has no real function other than personal preference.

The new version is spring return so all you have to do is push it.

quote:

mine leaks a bit when pumping but not when screwed down

That means its bad. If fuel can leak out, air can leak in.

When I lock it down it doesn't leak fuel or air. How do yo know the screw down has no function? It makes sense that there would be an over-riding seal in screw-down position.

(in reply to ForcedInduction)

Post #: 7

RE: Primer Pump - 5/22/2008 2:10:49 PM

ForcedInduction

Posts: 864
Joined: 5/20/2006
From: Federal Heights, Colorado
Status: offline

quote:

ORIGINAL: paddo

How do yo know the screw down has no function?

Because the new style is spring return.

_____________________________

1980 240D 3.0VNT 222K Miles. OM617.95, GT2256V VNT turbo, 4-speed manual, 3.46 diff, 15mm rear swaybar, ALDA removed, no EGR and Amsoil by-pass oil filter. Currently 107HP and 195lb/ft of torque at the wheels.

www.youtube.com/Turbo617

(in reply to paddo)

Post #: 8

RE: Primer Pump - 5/22/2008 4:09:01 PM

paddo

Posts: 42
Joined: 12/20/2007
Status: offline

quote:

ORIGINAL: ForcedInduction

quote:

ORIGINAL: paddo

How do yo know the screw down has no function?

Because the new style is spring return.