Porsche 928 Workshop Manual page 442

'_
9 2 8
'.I!: i-:1(.1 $)91C "I
-.-. --_- ~-.-__
0
CHECKINCT FN ,'?I " /'I j Y s T EM i OK / k 0, 1: .'
Engine mud ihc knrm iol !/,I~ I?<',
1. Connect and bleed pressure ga!jgc.
2. Bridge terminals 30 and S7.
3. Move selector valve to position 2 and wait
until "warm" control pressure is reached.
4. Take off bridge at terminals 30 and 87.
5. Observe pressure drop on pressure gauge and
compare it with Testing and Adjusting Data
on page 25 - 6.
6. If pressure drop is too fast, repeat test with con-
trol pressure circuit broken by moving selector
valve to position 3. If results are the same,
leak is in system pressure circuit.
If results of second test are good, leak is in
control pressure circuit.
I'nss~l~li l.i.:slts ill System Pressu~i
Cirr.I;ii
1. Check valve in pressure neck of electric duel
punrptsj.
2. Cold start valve.
3. O-ring iii system pressure regulator.
4. iue1 ;njcctor(si.
Possible Leaks in Control Pressure
Circuit:
hersure relief/residual pressure valve.
Printed inGermany - Iv. 1980 Checking Entire Fuel System for Leaks
25 11