Nate:
I was under the impression that the fuel pressure in the IP galley was due to the check valve on the back of the pump that has a banjo bolt and returns the fuel to the tank. I'm talking about the check valves on the delivery valves. If that is what you are talking about then I am at a loss to explain why. Either way 10 psi should be enough to refill the individual cylinder pumps. Perhaps a check valve and a small accumulator between the fuel filter and the inlet to the IP would smooth out the fluctuations.
On a different note I am now noticing a return of the/a weak cylinder when the engine gets hot. Is it possible that these check valves in the delivery pipes can stick or otherwise not seal properly when they heat up? It's easy enough for me to check. just swap out the valves one at a time until the problem goes away. But that's for tomorrow.
By the way, in my cleaning I found another 6 injectors. I will test them tomorrow too.
Good luck with it all. Keep us posted and maybe we can help.
Bogy.
"Hardware eventually fails. Software eventually works" - Michael Hartung
From: "vwnate1@yahoo.com [diesel_mercedes]" <diesel_mercedes@yahoogroups.com>
To: diesel_mercedes@yahoogroups.com
Sent: Tuesday, August 9, 2016 7:59 PM
Subject: [diesel_mercedes] Delivery Valves
Thanx ;
I was fiddling with the car to - day and installed a liquid filled American made pressure gauge between the fuel filter and the I.P. to check the transfer pressure .
With the old valve installed and a stretched spring I got 10 ~20 PSI fluctuating rapidly @ idle , revving it up it went to 23 PSI and stayed there , still vibrating the needle .
I then swapped out the old valve for a new one from Ma 'Benz and the idle pressure was 0 ~ 10 PSI and went up to nearly 20 PSI when I revved it , same flickering of the gauge's needle .
I don't know if this is normal or not ? .
-Nate
Bogy wrote :
First swap was between 3 and 4 on the same IP after cleaning the original #4..
When #3 (the old #4) still didn't work like I thought it should I swapped it with one off the om617 that I first put in the jeep.
So Both.
Bogy.
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Posted by: Bogy Wan Kenobi <polespearbogy@yahoo.com>
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