Suggestion on how to proceed...

[bobs77]

I still can't figure out how my simple job of changing hose has evolved into this? I should have some free time this next week to start troubleshooting.

Welcome to the wonderful world of old cars! This won't be the first time you fix one thing only to have something else pop up. I just went through refurbishing the FI system on my 77, and have to agree with Webdawg's suggestion to send the injectors out to be cleaned (you don't want to have to take this system apart again to do this later). I used Mr. Injector . You may want to also include the Cold Start Injector.

Replacing the injector connectors is another worthwhile project. This same connector is also used for the Cold Start Valve, AAR and Thermotime switch. You can find them with pigtails attached for about $3.95 each, or if you can buy a kit at Overboost.com, $12.60 for a kit of 8 connectors, and attach them yourself.

Good luck.

[bobs77]

Sorry--the link to Mr. Injector didn't come across. Here it is:

[semitch]

Thanks again for all of the suggestions.

Well....I woke up a little early this morning and ran down to Orchard Supply and fab together a pressure gauge. On the way I passed the local auto parts store and bought a new fuel filter for the heck of it. System pressured up and held approx. 36 to 37lbs with both the fuel pump/starter solenoid disconnected and with the engine running before the motor stalled out. This seems to eliminate the fuel pump, filter, dampener, and regulator.

I'm off for the next couple of days so I'll have a chance to work through the trouble shooting guides of the FSM and fuel injection manual. (Might also pull the injectors and send them out.)

The pressure is really on now. I just got word today that my wife's aunt is selling me her 67 mustang thats not running at a good price. I definitely can't have two non-operating cars in the garage it might cause some serious friction on the home front.....

[bobs77]

I'll take the mustang off your hands.....

[semitch]

Well who ever it was that made the electronic fuel injection troubleshooting book available to everyone THANK YOU! It made the process of finding what was wrong that much easier. Turn out to be a really corroded connector on the water temperature sensor that was screwing everything up. She is now up and running again. Now on my list of to do's is to replace all of my connectors unless someone knows if an aftermarket EFI harness available? Thanks again to everyone for the help.

Hey bobs77, thanks for the offer but now I'll just have to suffer and keep the stang too. :-)

[DatsunZsRule]

Ok I'm not understanding

"System pressured up and held approx. 36 to 37lbs with both the fuel pump/starter solenoid disconnected and with the engine running before the motor stalled out. This seems to eliminate the fuel pump, filter, dampener, and regulator."

How can you rule out the fuel pump with it disconnected? The correct way is to leave the pump connected during a fuel pressure discharge test to make sure it's functioning correctly. Also you may not notice any issues with the fuel filter when you first fired it up to test it because the "crud" is settled at the bottom and didn't get a chance to stir up yet and clog the filter.

Just my opinion again

[DatsunZsRule]

Well sounds like you got her going. Didn't see your last post. congrats. I'd still do the fuel filter though. It sounds to me like it hasn't been serviced in a long time and needs to be replaced.

[webdawg1]

While you're in the fix it mode, you might want to take a peek inside the fuel tank one day and see how it looks..... Might save you some grief down the road. Just a thought....

webdawg1

[DatsunZsRule]

I mentioned to check the tank too in reply #12 Definately not a bad idea. The W.I.A.I. (While I'm At It) bug isn't always a bad thing

[semitch]

Hey DatsunZsRule,

Sorry for the confusion. (All I can say is that I been working 12 hour night shifts for the last 6 nights.) When I checked the system pressure I first disconnected the starter solenoid in order to not start the car and pressured up the system on just the fuel pump when the ignition switch was turn to start. After I had confirmed that everything pressured up with out any leaks I started the car to see if the pressure would hold. The FSM walks through the process. I just had a brain fart when I started typing. Again I’m sorry for the confusion.

Hey Webdawg1,

I just got back from driving the car around and now reading up on checking the fuel tank. Thanks for the suggestion.

[DatsunZsRule]

Not a problem man Glad to hear you got it running good.

[webdawg1]

I'm not the only one that suggested you check it out.... (Your fuel tank) It was more of a afterthought really....if you do a search on (Fuel Tank Renu or fuel tank) you should turn up several places where you can send if off to and have it redone. Save you a lot of trouble down the road and should last you quite a few years. If it's anything like 95 percent of most of the Z's out there you'll probably have some crud/rust/who knows what you'll find in there.....

webdawg1