I have a vacuum sensor to plumb in, does it matter where the vac supply and the fpr pipes go. 1 way is slightly easier to blow through than the other.

 

I can answer this myself now. So don't reply.

 

Might want to share to help others. It does matter, as there is a vent to reduce vacuum on the switched side when in the off position.

 

Hi rgp

You don't even need it!

Just join those 2 pipes together and take it out of the mix

You can just leave it in there, or remove it altogether, as there is nothing behind it, its Blanked OFF

 

Oops, went in twice.

 

Hi OB, it's a heat sensor so it actually just get the heat off the rail, doesn't need to go into the fuel. 😊😊

 

Hi rgp

It's a Wax Thermostat that Controls the Vacuum that under Certain Conditions (if the Fuel in the Rail Should get Very Hot) it can enrich the Mixture for Easier Starting

In which case the Wax Stat Closes which then cuts down the Vacuum to enrich the Fuel Supply and then opens again when the Fuel is Flowing Normally, so indirectly it does affect the Mixture

While that may be the 'Theory' in Practice it's not needed. except maybe under Extreme Climatic Conditions, as even with it taken out of the Circuit by joining those Tubes Together or just replacing both of them with a Single Vacuum Tube, almost 100% of the time your Car should Start and Run as Normal

This Wax Stat can also be more trouble than its worth as if the Engine should get very Hot and the Wax in the Wax Stat Melts as it did on mine, unless you were aware of this your Fuel Consumption could go up, for what appears to be no logical reason and even cause back firing as mine did

Once I'd taken the Wax Stat out of the Circuit by using a Single Tube, everything then returned to Normal and I've never had that kind of problem since, with Thanks to 'Grant' 'The Wizard of Oz' who found out what was wrong and showed me how to Fix it

Sweet Smell Followed By A Massive Bang