[urq] CIS Fuel Pressure Regulatorurq urq at pacbell.netThu 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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