RE: [DMCForum] Fuel pressure values

["Dave Stragand" <dave.stragand@xxxxxxxxxxxxxxx>]

Rich,
 
The system pressure is a bit low, but not terrible.  What would be more
telling is a comparison of hot and cold values.
 
-Dave

-----Original Message-----
From: cruznmd [mailto:racuti1@xxxxxxxxxxxx] 
Sent: Friday, April 23, 2004 11:34 PM
To: DMCForum@xxxxxxxxxxxxxxx
Subject: [DMCForum] Fuel pressure values


Ok, the pressure test rig reads the following values:

When the rig is installed with the T-valve towards the distributor, I 
get the following pressures:

Valve open: 0 (zero) bars/psi.
Valve shut: 4 bars.

This didn't seem right to me, so I turned it around so that the T-
valve was towards the CPR. (John later confirmed this for me) With 
the engine off, RPM relay jumpered I read the following values:

Valve open: 3.7 bars
Valve shut: 4.5 bars

Engine running (RPM relay installed normally), the following values:

Valve open: 3.7 bars
Valve shut: 4.6 bars

The manual states that the nominal values are:

Primary pressure: 
   Checking pressure: 4.9-5.5 bars
   Setting pressure:  5.1-5.3 bars

Control pressure:
   Max: 3.5 bars
   Min: (when cold) 1.4ish bars
-------------------------------------------------------------------
Assuming that I had the rig set up right (I'm fairly confident), my 
control pressure is a tad high, and main line is a tad low. Combined 
with possibly dirty injectors could this account for such a dramatic 
loss of power?
Oh, I discovered that my air filter is filthy already too. (9 months 
old)

Am I making too much of the small variation in values?
To put this in perspective for my fellow Americans; 

I have as much as 3 psi too much control pressure,
and anywhere from a 7.25-14.5 psi LOSS of main line pressure.
(1 bar= apprx. 14.5 psi) (Which primary pressure value do I 
use? "Checking" or "Setting"?) See the fuel section of the workshop 
manual.

What say you?

Rich A.
#5335





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