Fuel shut off solenoid

[isuzu Specialities]

I am a firm believer that with older vehicles repairing the defective parts is always better than replacement. This holds true with newer cars too after comparing the cost of replacement VS cost of repair.

Here we have a fuel shut-off solenoid from a Isuzu diesel. The part isn't all that expensive to replace, however regardless of brand a new part is of far less quality. When weighing the cost VS quality between replacing and repairing the repair wins by a long shot.

The repair takes 30 minutes & requires no special tools. Fundamentally it's as simple as popping open the case attaching new wires, replacing the oil seal, assembly and reseal the case.

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attachment=1]PXL_20240712_235451805.jpg[/attachment]

[cwill]

Where is this relative to the IP?

[JoeIsuzu]

I am a firm believer that with older vehicles repairing the defective parts is always better than replacement. This holds true with newer cars too after comparing the cost of replacement VS cost of repair.
Here we have a fuel shut-off solenoid from a Isuzu diesel. The part isn't all that expensive to replace, however regardless of brand a new part is of far less quality. When weighing the cost VS quality between replacing and repairing the repair wins by a long shot.

The repair takes 30 minutes & requires no special tools. Fundamentally it's as simple as popping open the case attaching new wires, replacing the oil seal, assembly and reseal the case.

No special tools? Why do I see pics of a lathe?

Jack

[isuzu Specialities]

I am a firm believer that with older vehicles repairing the defective parts is always better than replacement. This holds true with newer cars too after comparing the cost of replacement VS cost of repair.
Here we have a fuel shut-off solenoid from a Isuzu diesel. The part isn't all that expensive to replace, however regardless of brand a new part is of far less quality. When weighing the cost VS quality between replacing and repairing the repair wins by a long shot.

The repair takes 30 minutes & requires no special tools. Fundamentally it's as simple as popping open the case attaching new wires, replacing the oil seal, assembly and reseal the case.

No special tools? Why do I see pics of a lathe?

Jack

I chose to use the lathe because it's there & the best tool in my arsenal. A basic ordinary pipe cutter, hacksaw or die grinder can be used in place of it.

[JoeIsuzu]

I'll post a pic of a C223 fuel cutoff solenoid once I once I find it. If I recall correctly, it's quite a bit smaller than the one pictured.

Jack

[puttputtinpup]

Where is this relative to the IP?

On the c223 diesel, it screws into the top of the injection pump. When energized, it opens up the flow of fuel from the filter. De-energized, a little spring pushes a rod down shutting off the fuel. There should be, if I remember correctly, 1 wire coming off the fuel solenoid

[isuzu Specialities]

Where is this relative to the IP?

screws into the top of the injection pump. When energized, it opens up the flow of fuel from the filter. De-energized, a little spring pushes a rod down shutting off the fuel. There should be, if I remember correctly, 1 wire coming off the fuel solenoid

Thats exactly how these solenoid valves work. Some solenoids have a single wire connection, some have 2 wires & others have 3.

[puttputtinpup]

On this injection pump there's only 1 wire to the fuel solenoid. If you spot a device on the injection pump with 2 wires, it might be a tach sensor.

[Halden]

This wouldn't fit on the IP of a 2.2. This looks more like something you'd see on an inline pump with a pull and hold function, hence the two different wires...

[isuzu Specialities]

This wouldn't fit on the IP of a 2.2. This looks more like something you'd see on an inline pump with a pull and hold function, hence the two different wires...

1 VS 2 VS 3 wire solenoids..... One wire solenoids are grounded via the housing. 2 wire solenoids are grounded via the seconded wire. 3 wire solenoids are the same as a 2 wire with the 3rd wire being used for a feedback circuit. Normally used by the ECM for solenoid on/off validation. As long as the solenoid type, mounting depth and mounting style are the same 1, 2 & 3 wire solenoids are all interchangeable.
The vehicle had a lot of non-factory parts and many customizations done to it. The fuel solenoid was not responding due to the wires being bare and shorted. I'm not sure what pump the engine had nor did I bother to investigate as troubleshooting the fault was completed in under 10 minutes. Regardless what pump, solenoid or electrical system the truck was using, the repair procedure depicted above of this solenoid is the same for all others solenoid vales.

[JoeIsuzu]

My spare was buried too deep. But here's a pic of the one on my C223-T.

IMG_7785.jpeg (94.44 KiB) Viewed 3541 times

I have a shiny new one in a baggie somewhere. The next time I run across it, I'll get a picture and replace the one above.

Jack

[JoeIsuzu]

I thought I had a new one, but I ran across this today, and it's a take-out.

The single wire does not even go through the housing. It uses a ring terminal, secured by a nut on a threaded terminal. So if this were to break off, repairing/replacing it would not even require removal of the solenoid from the pump.

Jack

[Halden]

This wouldn't fit on the IP of a 2.2. This looks more like something you'd see on an inline pump with a pull and hold function, hence the two different wires...

1 VS 2 VS 3 wire solenoids..... One wire solenoids are grounded via the housing. 2 wire solenoids are grounded via the seconded wire. 3 wire solenoids are the same as a 2 wire with the 3rd wire being used for a feedback circuit. Normally used by the ECM for solenoid on/off validation. As long as the solenoid type, mounting depth and mounting style are the same 1, 2 & 3 wire solenoids are all interchangeable.
The vehicle had a lot of non-factory parts and many customizations done to it. The fuel solenoid was not responding due to the wires being bare and shorted. I'm not sure what pump the engine had nor did I bother to investigate as troubleshooting the fault was completed in under 10 minutes. Regardless what pump, solenoid or electrical system the truck was using, the repair procedure depicted above of this solenoid is the same for all others solenoid vales.

This is not always the case. Plenty of case grounded two wire with pull and hold. It's not always for a feedback circuit...