Fuel system - help with identification

[Heisenberg]

1978 2F. (Non US model)
Noticed no fuel in are bulb. Checked fuel system and nothing being sent thru. Checked blue wire to thing in picture and no power getting thru.
Bypassed thing in picture and it all works fine.

Is that a pump or filter?? Do I need it?
Checking in the FSM I can't see what it is as it looks different to what's in my book.

The blue wire appears to go up to the ignition area behind the dash somewhere that I can't trace easily.

Any help appreciated.

 

[78fj40mg]

Is there power on the blue wire with ignition on?

 

[Heisenberg]

No, no power at any point on the blue wire.

 

[Solace in Solitude]

I've never seen an electric fuel filter...

I.suspect that is some sort of electric fuel pump, but it should have a power wire and a ground/earth wire... Unless it grounds to the bracket or something.

It's possible a PO added an electric fuel pump, to boost the fuel flow of the OEM mechanical pump... Assuming you have a mechanical pump.

Is there a switch on the dash that controls that pump (assuming it's a fuel pump)? Maybe you turned it off, not realizing what it was for... If that's the case, maybe having it connected and not powered results in a closed 'gate'...

Easiest way is to track the wire back to its source.

 

[Heisenberg]

I've never seen an electric fuel filter...

I.suspect that is some sort of electric fuel pump, but it should have a power wire and a ground/earth wire... Unless it grounds to the bracket or something.

It's possible a PO added an electric fuel pump, to boost the fuel flow of the OEM mechanical pump... Assuming you have a mechanical pump.

Is there a switch on the dash that controls that pump (assuming it's a fuel pump)? Maybe you turned it off, not realizing what it was for... If that's the case, maybe having it connected and not powered results in a closed 'gate'...

Easiest way is to track the wire back to its source.

Thanks, I think it is a electric fuel pump, thats what others have mentioned. I would appear to earth off the chassis, but I bypassed the earth and tested the blue wire with the battery terminal for earth with no luck - I have never seen nor used a switch for it. I had been playing with the radio wires up under the dash and may have knocked something. All my fuses are fine and I cant see where it goes to. If it runs fine without it, and is just an auxiliary then I wonder if its safe to leave it out, or as someone else suggested do I run a fused direct line from the battery?

 

[Downey]

Is there any possibility that it is a pump used to move gas from a rear tank to a front tank?????

 

[RobNasty]

Could it be some sort of clever anti-theft (fuel cutoff) device? And the "switch" is intentionally concealed somewhere?

 

[78fj40mg]

A fuel pump typically has two wire leads a positive and a neg, in this case the object has a single wire lead, is the body grounded in any way? It's probably a solenoid valve but still needs a grounding point.

 

[Heisenberg]

There is a switch on the dash that the PO didn't know what it was for. The truck ran LPG before I got it. Will check out that switch. The LPG/Gas dial is still there but I'm wondering if an electric pump was used as an auxiliary or as part of the LPG setup that had not been removed.

 

[Tools R Us]

There is a switch on the dash that the PO didn't know what it was for. The truck ran LPG before I got it. Will check out that switch. The LPG/Gas dial is still there but I'm wondering if an electric pump was used as an auxiliary or as part of the LPG setup that had not been removed.

In this case, it could be a gas cut off solenoid for when LPG is being used. If LPG isn't going to be used, remove it?

 

[Heisenberg]

That makes sense. Now I think about it I turned the LPG/Gas knob when I was playing around. Not sure if it was Pre or post fail. Will check after work and report back

 

[Heisenberg]

Happy days. So I put a meter on the blue wire and switched the old LPG switch and low and behold, two of the four options are power to the blue wire so its def the cut off solenoid. So, based on that, I will leave it bypassed and eventually pull it all out! Thanks everyone for your help.