[urq] Fuel system diagnostiocs , part 2

[Patrick Carlier]

Now that I have the elctrical isuues sorted out , the nex step is to 
measure various pressures . 

To do this , a so called cis gauge set is needed . 
Often sold at more then 150$ .
I've build mine for 10€ /15$ and some spare parts . 
It takes a small valve , a pressure gauge of at least 6 bar . 
8 or 10 bar won't hurt . 
And some plumbing to put it all together . 
Anyone wan't to see it , drop me a mail and I'll send you a few pictures . 

The system presure should be 5.50 to 6.50 bar . 
This is measured by closing the valve on the gauge set , wich eliminates 
the warm up regulator . 
I've got 5.80 Bar , should be allright . 
System pressure is detremined by a reducer on the cis head itself . 
Close to the feed line from the pump . 

Next is the regulated pressure . 
For this test , the engine must run . 
Open the valve , start the engine and monitor pressure . 
At first with a cold engine pressure is low . 
A bit more then 1 bar at ambient temperature . 
With the  engine running , in a few minutes it should rise 
to about 3,50 Bar . 3,75Bar being the maximum . 
Mine checks out pretty good . All within spec . 

Finally the engine is shut down , and residual pressure can be measured . 
Should be 3,00Bar , and should hold to at least 2,60 after 20 minutes . 
I guess I have a little problem here . 
Altough the pressure holds to 2,40 for 20 minutes , after an hour it is all
gone .  So I must have either a leaky check valve or one or more injectors . 

I'll probably wait to look at the check valves until I can do the injector leak test . 

Pat