Fuel leak from pump

[Justinlb]

I have a fuel leak from my pump coming from the square hole, im unsure of what it is used for.

Its  lot of fuel pumping out of it (leaving a puddle of gasoline on the ground and casing my engine to backfire).the pump isn't that old either and has worked flawlessly until this evening.

What could possibly be the problem?

Is the hole needed for something? 

 

Picture is for reference of the square hole (not my picture).

 

It seems like all of the new parts I buy end up breaking or going bad before the original engine parts.

[Victor W]

Hate to say it but you pump is going bad. Mine leaked the same when the diaphragm started to deteriorate. I'd get a fresh rebuild or the kit to redo it soon.

[JFranklin]

It probably wasn't intended to work with E-10 gasoline.

[Bloo]

Gas shouldn't be getting to that hole. The diaphragm is bad.

 

The diaphragm on one I took apart was just a bunch of layers of cloth. No doubt it was originally doped with something, probably shellac based. The solvent for shellac is..... ethanol. With the shellac gone the gas was just pouring through the cloth.

 

Check out Then N Now automotive for new ethanol-resistant internal parts. https://www.then-now-auto.com/ 

[Brooklyn Beer]

Simple rebuild. Typical E-gas issue. The new E resistant materials will fix it. 

[Brooklyn Beer]

Check your oil BTW and see if you have any cross contamination.  On Mopars a leak that bad will contaminate the oil.