Electrical / Power issue to fuel pump

[DMC5180]

Is it buzzing when the key is in the run position? Put your hand on it.

If it's buzzing, you next want to verify the valve isn't stuck. You check it by swinging the CS pipe towards you as far as it will go (1/2" or so) and removing the short connector hose from the ISM spigot. You should be able to push the hose aside enough to be able look in the spigot opening with a flashlight. Then turn the key to the run position and watch the valve. It should close then open over about 10-20 seconds.


Dennis

[OutOfTime]

Is it buzzing when the key is in the run position? Put your hand on it.

If it's buzzing, you next want to verify the valve isn't stuck. You check it by swinging the CS pipe towards you as far as it will go (1/2" or so) and removing the short connector hose from the ISM spigot. You should be able to push the hose aside enough to be able look in the spigot opening with a flashlight. Then turn the key to the run position and watch the valve. It should close then open over about 10-20 seconds.


Dennis

Yes, it is buzzing. Confirming this little hose is what you are saying to remove and look inside:

CS.jpg

[DMC5180]

Yes


Dennis

[OutOfTime]

You should be able to push the hose aside enough to be able look in the spigot opening with a flashlight. Then turn the key to the run position and watch the valve. It should close then open over about 10-20 seconds.

I turned the key to the run position and was able to observe the valve slowly close, however it did not reopen, it stayed closed. Is that normal?

[DMC5180]

Your really just confirming that it moves and is not stuck in the closed position. You should be Good.

I run a DM eng idle ECU, so mine cycles differently that the stock ECU. My ISM pops open 50% after about 3 seconds of being fully closed.

Every time you cycle key the ISM fully open first?

[Bitsyncmaster]

I turned the key to the run position and was able to observe the valve slowly close, however it did not reopen, it stayed closed. Is that normal?

I think that is normal for the stock idle ECU setup. It should quickly pop about half open when your first turn the key on then slowly close or open fully. I can't remember which way it went.

[OutOfTime]

Still no idle... What is the standard setup for the idle microswitch? Its pressed down completely now, I have to press the gas (or twist the throttle control) to get it to "click". Is that proper?

Thanks

[DMC5180]

Yes, that is normal operation. As long as the switch is down when the throttle is released, the ISM ECU will be energized and controlling the ISM.

It may be time to start looking for potential vacuum leaks. Review the routing chart on the underside of the engine cover. It's also possible the CO adjustment is way off. I noticed you have the removable CO plug. Who knows what the PO did considering your inertia switch was gone.