1989 Grand Marquis ECM removal

[friskyfrankie]

Yeah I’ve already unhooked the filter on the tank side. I guess I’ll have to drop the tank again.

If the fuel pump needs replacing, try to get a high quality one as this is certainly (as you are already aware) NOT a job you want to keep doing. As I mentioned previously, even if the relay "may" be good, I'd change it anyway as it is easily accessible and relatively cheap.

[monotonorobo]

Yeah it’s too cold to try to fit a tank with barely enough clearance in past the exhaust. I might just send it to a shop and call it a day.

[monotonorobo]

Haven’t sent it off yet cause it’s just a project, but I’ll still try to look into in the meantime since I got the feel to again. Could TPS being out of spec cause NO fuel from the pump? And do pumps usually dump fuel before going bad? I’m just trying to find the correlation between having fuel being rich then going to no fuel at all in a span of two days. And as a reminder, it ran when it was running rich but only for about 15 seconds before stalling and/or dying. At the time I was still getting code 23 and 63. Also gonna drop the tank on just the left side and prime it to see what happens.

[friskyfrankie]

Haven’t sent it off yet cause it’s just a project, but I’ll still try to look into in the meantime since I got the feel to again. Could TPS being out of spec cause NO fuel from the pump? And do pumps usually dump fuel before going bad? I’m just trying to find the correlation between having fuel being rich then going to no fuel at all in a span of two days. And as a reminder, it ran when it was running rich but only for about 15 seconds before stalling and/or dying. At the time I was still getting code 23 and 63. Also gonna drop the tank on just the left side and prime it to see what happens.

I've seen fuel pumps go bad on a moments notice so anything is possible! Somebody need to test the pump and relay. Sure sounds like fuel starvation.

[monotonorobo]

I've seen fuel pumps go bad on a moments notice so anything is possible! Somebody need to test the pump and relay. Sure sounds like fuel starvation.

Alright, I never checked the relay due to mine being extremely hard to get off for whatever reason. Maybe it corroded on the pins. Got any way to get it off without possibly breaking it?

[friskyfrankie]

Alright, I never checked the relay due to mine being extremely hard to get off for whatever reason. Maybe it corroded on the pins. Got any way to get it off without possibly breaking it?

Perhaps electrical contact cleaner, if you can get it in, but it really should not be that difficult to remove unless there is another issue like corrosion.

[gadget73]

TPS isn't related to fuel pump. If its completely bad in the wrong way it will shut off the injectors but the pump will run.

No pump is usually either the pump is actually bad, or a power supply problem. Ground the fuel pump connector in the self-test plug, turn the key on, and do some voltage tests



I'd probably head to the trunk and verify you have +12v at both sides of the inertia switch if the pump doesn't sound like its running. I had a bum inertia switch connector leave me stuck somewhere once.

If the pump runs and you have no pressure, either the line inside the tank is split, or the fuel filter is somehow completely plugged solid. Or the fuel line is blown out somewhere along the car but I'd like to think the flood of gasoline would be pretty obvious.

[friskyfrankie]

Forgot about the inertia switch. Good point! May not be the issue but quite easy to check.

[monotonorobo]

TPS isn't related to fuel pump. If its completely bad in the wrong way it will shut off the injectors but the pump will run.

No pump is usually either the pump is actually bad, or a power supply problem. Ground the fuel pump connector in the self-test plug, turn the key on, and do some voltage tests



I'd probably head to the trunk and verify you have +12v at both sides of the inertia switch if the pump doesn't sound like its running. I had a bum inertia switch connector leave me stuck somewhere once.

If the pump runs and you have no pressure, either the line inside the tank is split, or the fuel filter is somehow completely plugged solid. Or the fuel line is blown out somewhere along the car but I'd like to think the flood of gasoline would be pretty obvious.

Yeah I remember when you said something about the split in the line, I was gonna check regardless but I just wanted as much info as I could get so if that wasn’t the problem I could have an idea of where to go next. And if the fuel line is blown out then I already know where to look from there. only possible place would be the line on the rear of the filter (tank side).

[sly]

You may also try whacking the inertia switch to trip it and then reset it. Had to do that on my wife's car once. Also had to replace the fuel pump relay at least once on all the cars.

[monotonorobo]

You may also try whacking the inertia switch to trip it and then reset it. Had to do that on my wife's car once. Also had to replace the fuel pump relay at least once on all the cars.

I’m about to mess with the car today, how would I reset it? Just unplug the battery for a while and connect it again? I think it’s either the pump or the inertia switch cause no gas on the ground but I hear the whine. And you mean like a literal whack as if it were a starter solenoid?

[gadget73]

push the button on top of it. it will click.

and yes, a literal whack. If its not tripped you'll hear a spring noise when it pops. Its basically a metal ball and a spring in there, if the ball moves too much the spring pops the contact open.

[monotonorobo]

Ok thanks. Didn’t know it had a button on it since I haven’t seen it yet, it rained today.

[monotonorobo]

Also, snapped a bolt on the fuel rail. All the others are in and tight. My drill broke on me but I have self tapping screws I could use, or would I be fine with the 3 in? There is little to no play on the rail with it off.

[sly]

That end will risk lifting off under pressure and spraying fuel on the engine/exhaust. I'd get a center punch on the broken bolt and keep trying to extract the bolt before running it.