Thought of the day-Innovative car repairs

[Basil]

I agreed to replace the fuel pump in a friend's 98 XK8, and after scoping the job out I can commiserate with this. I am not looking forward to this job.

Is it an in/tank fuel pump?

 

[equiprx]

Is it an in/tank fuel pump?

That's right after the "facelift" XJS with in tank fuel pump(s).
One for the 4.0 and two for the 6.0.
I never did one in an XK8 though.

 

[waltesefalcon]

Is it an in/tank fuel pump?

Yup, and it has a fuel line that comes out the bottom of the tank and bottom of the trunk, just above the diff. There isn't enough space to access it without dropping the prop shaft and lowering the rear end some. Hurray...

 

[equiprx]

Yup, and it has a fuel line that comes out the bottom of the tank and bottom of the trunk, just above the diff. There isn't enough space to access it without dropping the prop shaft and lowering the rear end some. Hurray...

It is possible to disconnect those hoses.
All that's needed is to slide out the D rings on the hose fittings.
It's a tight squeeze getting up there, but it's doable.
Are you sure you want to remove the tank?
After I did that I found out the problem was not tank related.

 

[waltesefalcon]

It is possible to disconnect those hoses.
All that's needed is to slide out the D rings on the hose fittings.
It's a tight squeeze getting up there, but it's doable.
Are you sure you want to remove the tank?
After I did that I found out the problem was not tank related.

What was it in your instance?

 

[equiprx]

What was it in your instance?

Turned out it was the fuse for the Heated O2 Sensor.
On the 94 that fuse is in the trunk, number 9 if I recall.
We tried so many diagnostics and component replacements for 6 months.
During that time I had to jump the FP harness to the battery.
We knew the pumps were good.
One of my coworkers who is a Master Jaguar Technician found it.
He took the wiring diagrams home with him and traced out the circuits.
Next morning he said to test that fuse, he was a genius.

 

[waltesefalcon]

Turned out it was the fuse for the Heated O2 Sensor.
On the 94 that fuse is in the trunk, number 9 if I recall.
We tried so many diagnostics and component replacements for 6 months.
During that time I had to jump the FP harness to the battery.
We knew the pumps were good.
One of my coworkers who is a Master Jaguar Technician found it.
He took the wiring diagrams home with him and traced out the circuits.
Next morning he said to test that fuse, he was a genius.

That gives me something to mull over. I'll go over on Saturday and take a look at that.

 

[Basil]

Turned out it was the fuse for the Heated O2 Sensor.
On the 94 that fuse is in the trunk, number 9 if I recall.
We tried so many diagnostics and component replacements for 6 months.
During that time I had to jump the FP harness to the battery.
We knew the pumps were good.
One of my coworkers who is a Master Jaguar Technician found it.
He took the wiring diagrams home with him and traced out the circuits.
Next morning he said to test that fuse, he was a genius.

My daughter-in-law's Grand Prix was giving a code that said the heated O2 sensor was bad. So naturally, we replaced the sensor, but the code kept coming back. Finally, I traced the wiring back and discovered that it wasn't getting power for to the heater element on that sensor. After further investigation, I discovered that one of the wires to the sensor was broken. Thinking a-ha this is an easy fix. I repaired the wire, but to my chagrin it still was not getting power. The fuse checked good. It took quite a bit of additional troubleshooting to determine that the issue wasn't the fuse, but the actual fuse socket where the fuse plugged into. For some reason, the fuse was not making good connection. There was no easy way to repair or replace that fuse socket so I ended up putting a small flat piece of copper alongside the fuse leg that was not making good connection and that solved the problem.

 

[John Turney]

My daughter-in-law's Grand Prix was giving a code that said the heated O2 sensor was bad. So naturally, we replaced the sensor, but the code kept coming back. Finally, I traced the wiring back and discovered that it wasn't getting power for to the heater element on that sensor. After further investigation, I discovered that one of the wires to the sensor was broken. Thinking a-ha this is an easy fix. I repaired the wire, but to my chagrin it still was not getting power. The fuse checked good. It took quite a bit of additional troubleshooting to determine that the issue wasn't the fuse, but the actual fuse socket where the fuse plugged into. For some reason, the fuse was not making good connection. There was no easy way to repair or replace that fuse socket so I ended up putting a small flat piece of copper alongside the fuse leg that was not making good connection and that solved the problem.

We had something similar to our Subaru. It turns out a test connector was connected that shouldn't be.