Shurflo leaking

[spooledstang]

My alky setup has been working awesome for about a month, but now it has a very bad leak at the pressure switch. I took it apart, and the seal between the pressure switch and the pump looks like the culprit, it is tearing apart. I've been running M10 at 75psi with 100% methanol. Not sure what I should do now, if I put it back together it may fail again. Any suggestions? All I can think of is that the cycling of the pump wore out the seal.

 

[Razor]

It may be how and where the pump is mounted. My pump has been on my car for over a year and no leaks. Nor has anyone i've sold had issue.

Contact Shurflo, they will take care of you. Typically the pump comes with a one year warranty, and shurflo sends you the parts n/c.. this is what someone posted some time ago.

On another site, h20injection.com.. the problem surfaced, and the fix was to use a bicycle rubber innertube for a gasket.

My pump distributor has never seen this problem... not to say it cant happen.. but... if you wanted to make a gasket, use sheet teflon.. or contact shurflo for the gasket.

lastly... Northern tools when they package pumps into boxes stuffs a piece of packing material into the box, then drops the pump into the box. In other words they dont wrap, pack correctly the pumps, when they ship them. And I have had customers who bought pumps from Northern come with damages to their pumps. maybe it got whacked when shipped.

HTH

 

[spooledstang]

Its not how it was shipped. The seal between the switch and the pump looks fatigued to the point that it started tearing, or sort of blowing out around the perimeter. It does not affect pressure, perhaps others have bad seals as well, but since my pump is mounted upside down (pressure switch at bottom) the leak persists when the pump is idle. If the switch is on top, it would only leak under pressure, and maybe not enough to notice.

 

[Razor]

Mines mounted on its side.. humm.. no leaks. And I run 125 PSI+ out of it.. so I would notice a leak. So if it were to blowout under 75 PSI pressure.. mine would have gone 12 months ago. And I only run straight methanol.

If you bought your pump from Northern...... it didnt get to you well packed/handled. Not saying this is the reason.

Did you use a lube with your alcohol?

 

[spooledstang]

The seal didn't blow out, I was trying to describe the way it tore, around the perimeter. If you understand how the pressure switch works, the seal pulses with the pump, the seal is whats contacting the pressure switch. As the pressure builds on the pump side of the seal, it pushes the pressure switch. So I think it may be the constant pulsing of the seal that fatigued it, not the pressure. Since the progressive system has the switch bypassed, the seal would not wear out like this. I don't run any lube as I was told the Shurflo doesn't need it.