[urq] CIS Fuel Pressure Regulator

urq urq at pacbell.net
Thu Dec 6 23:26:00 PST 2007


I have been hesitant to use my car for anything but very short jaunts with
the fuel injection and ignition control in its current state.  Some times
the car cranks without firing, especially if it is cool (can't really say
cold here in central California) or the battery voltage is low.  I've been
suspecting the hot start pulse relay, but tonight I unplugged it completely
and the car still wouldn't fire.  Side note, I opened the relay up and found
there was an adjustment on it ... using a 9 volt battery for power I
adjusted the delay and pulse rate to the slowest possible.  

So, I decided to get out the MC-2 fuel distributor and mounting plate to
compare with the original WX unit I used to have on the engine.
Fortunately, when I did the adaptation I mounted the parts from the MC-2
onto the WX airflow sensor plate/fuel distributor so I can see how they were
originally.  I think I now realize what I missed that made it so the car
wouldn't start with this plate in place.  The MC-2 has an external fuel
pressure regulator, where the WX has the regulator built into the
distributor proper.  I removed the MC-2 pressure regulator because rotating
the airflow sensor plate 180 degrees as needed to match the mounting scheme
on the urq moved the regulator from under the quarter panel to interfering
with the intake manifold.  I don't know what is in the place where the
integral regulator would go ... but it probably isn't a redundant regulator!
:-)

So ... I have two options ... transfer the integral regulator to the MC-2
distributor or figure out some way to make the external regulator work.  The
problems I see with the first option are: the system pressure is different
on the WX compared to the MC-2, and I doubt I'll have the seals and such to
do the swap (I also had a bad experience trying to repair the integral
regulator on my '78 Fox).  I spent some time looking at what the individual
parts are for the external regulator, and it seems like I'll need to do some
custom fabricated lines to even have a chance of making it work.  

ISTR that there are folks here who have adapted the MC-2 fuel distributor to
their urq ... if so, I'd appreciate hearing which approach you took ...
transfer the integral regulator or fit the external unit somehow.  

TIA!
Steve B
San José, CA (USA)



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