PeachParts Mercedes-Benz Forum

PeachParts Mercedes-Benz Forum (http://www.peachparts.com/shopforum/index.php)
-   Diesel Discussion (http://www.peachparts.com/shopforum/forumdisplay.php?f=15)
-   -   Problem I've been running into (http://www.peachparts.com/shopforum/showthread.php?t=217915)

Monomer 03-30-2008 12:19 AM
Problem I've been running into
 
Both my 83 rabbit AND my g/f's 76 300d suffer this problem.


The IP is loosing it's "prime."


The cars will run fine when warmed up. But after sitting for an hour or so, they will be hard to start (both have working GP systems) White smoke is usually put out.

It takes some cranking and a lot of "pedaling" to get the cars fired up. I have to sit out and "babysit" the rabbit to get it to stay running for the first few mins. before it idles at all, w/o stalling.




I don't see this problem covered at all on here. I can't be the only one with this problem...

compress ignite 03-30-2008 12:52 AM
Prime
 
First thing I guess at would be a loose connection somewhere between the
tank and the IP that allows air to enter the fuel system.
Loose hose clamps,old cracked plastic(by now they look brownish/yellow)fuel
lines (on the MB),old cracked rubber lines.The VW MAY have a fuel/water
separator (underneath the passenger side chassis,just forward of the rear
wheel...funny looking square box with a knurled plastic wheel you'd turn to
bleed off the H2O...Notorious for breaking off...might allow air in?)mine did.
The lift pump on the MB is always a favorite location.

Monomer 03-30-2008 01:05 AM
I plan on replacing most "soft" fuel line on both cars.

The harder line found on the MB, is that Standard, lowes silicon hose? Can I snap these off their fitting and replace with the lowes stuff?


The rabbit has a fuel filer with a bung at the bottom for draining out water. Filter's new.

I've NEVER seen a primer pump like the one on her MB. It's located right on the filter. seems to work, as I see NO leaks when pumping. Her car only started doing this after I replaced the primary fuel filter (on a w115, this is no easy task, they really hid this thing!)

Brian Carlton 03-30-2008 11:04 AM
Quote:
Originally Posted by Monomer (Post 1808529)
The harder line found on the MB, is that Standard, lowes silicon hose? Can I snap these off their fitting and replace with the lowes stuff?
I would encourage you to purchase new OE parts for the lines that run from the lift pump to the secondary filter and onto the IP. These lines come with the banjo attached and I'd not recommend you try to add your own hose to the existing fittings.

Additionally, I'd be curious as to whether the check valve in the IP might be causing you any issues. It's the bolt that's right at the outlet of the IP where the line returns to the secondary. If the spring is weak, it could be allowing the fuel pressure to drop during extended periods of shutdown.

Monomer 03-30-2008 06:14 PM
Quote:
Originally Posted by Brian Carlton (Post 1808711)
I would encourage you to purchase new OE parts for the lines that run from the lift pump to the secondary filter and onto the IP. These lines come with the banjo attached and I'd not recommend you try to add your own hose to the existing fittings.

Additionally, I'd be curious as to whether the check valve in the IP might be causing you any issues. It's the bolt that's right at the outlet of the IP where the line returns to the secondary. If the spring is weak, it could be allowing the fuel pressure to drop during extended periods of shutdown.
with the VW, theres no way of tracking down an OE...I'll see how much the lines would cost for the MB.


Are we talking the check valve on the MB or the VW? The VW has a "rebuilt" Bosch VE pump. The PO said it's a fresh rebuild from some shop in CA, but according to him the "new" tires were good (they were heat stamped....they're 14 years old and dry rotted)

compress ignite 03-30-2008 07:01 PM
check valve
 
BC is talking about the check valve on the Mercedes.

Where is the VW's water separating filter...In the engine Compartment...
or on the underside of the chassis?

Monomer 03-30-2008 07:09 PM
Quote:
Originally Posted by compress ignite (Post 1809015)
BC is talking about the check valve on the Mercedes.

Where is the VW's water separating filter...In the engine Compartment...
or on the underside of the chassis?
right by the cowl on the passenger's side under the hood.

running-snail 03-30-2008 08:56 PM
Take a look at this very old post by Larry Bible (saw your post - then ran across this doing a search on a/c compressors):

Quote:
Originally Posted by LarryBible (Post 62385)
And the winner is........... Benzmac!

Benzmac was right on with his diagnosis. I replaced the fuel filter as he said, but there was still an air leak. I pulled the injector return line, the small one from number one back to the top of the filter, there was no fuel. This was after it sat overnight. I trimmed it and put it back on. This didn't help.

I pulled the cigar hose, and the clamp had a dent in it, a v that was pointing in toward the hose. I trimmed the hose just a little, banged the dent out of the clamp and put it back together. Now, in the morning, you don't have to keep grinding the starter after it begins firing.

Thanks for everyone's patience on this.

The car is now up in very good shape except for the blow by. It uses a quart in 600 to 900 miles. My daughter is learning how important it is to stay after the oil level.

Have a great day,


All times are GMT -4. The time now is 07:31 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website