Foamy Water Spray To Detect Vacuum Leaks ???

[bobgritz]

In the past, I always sprayed a carburetor starting fluid (or spray bottle of mixed gas/oil) when trying to find a vacuum leak (RPMs would increase). I recently read a post that mentioned using 'foamy water' to detect vacuum leaks.

I imagine this would also cause a change in the rpm's (a drop in rpm's) but it might also have the advantage of 'bubbling' if it was sprayed onto an area of positive pressure seapage.

Hmmm, interesting! Anyone out there use foamy water to detect leaks in and around the carb, fuel pump, etc.?

 

[Bob_VT]

Re: Foamy Water Spray To Detect Vacuum Leaks ???

Okay........ just my opinion.

Positive pressure seepage would result in a leak if a fuel line and could be seen. There are not many positive pressures that a normal carbed motor have.

A vacuum leak could draw in the water but........ introducing water may not be the best option since it could contaminate the fuel system and only dislodge carbon.

Now........ water can be introduced and used as a de-carb procedure..........and in small amounts you reaally might not hear any change at all.

 

[cyclops2]

Re: Foamy Water Spray To Detect Vacuum Leaks ???

I find vacuum leaks to be quiet. So I use a vacuum gauge and Vasaline.

I had a bitchy vacuum leak one time. Went over the system 2 X with Vasaline. NOTHING changed. Brought out & used the...SMALLEST... vise grips carefully on each vacuum hose. BINGO. Small split on the bottom of it. I was ready to smear Vasaline COMPLETLY on every item & hose next.

I am a Pit Bull on finding a baddy.