J10rena idles great but possibly floods out one cylinder. Why?

[ba_50]

How would the late carb with the plastic top flood out a cylinder? Thank you.

 

[Cofe]

Re: J10rena idles great but possibly floods out one cylinder. Why?

If it is the lower cylinder flooding, it could be your fuel pump is leaking internally through the diaphragm into to lower cylinder via the pulse connection.


To test, remove the two mounting screws on the pump. Then pump the primer bulb and see if fuel leaks out the back of the fuel pump where the pulse connection is at. If it leaks, you will need to rebuild or replace the fuel pump.

 

[ba_50]

Re: J10rena idles great but possibly floods out one cylinder. Why?

The carb was already off because the mechanic wants to check it today. I took the fuel pump off and plugged the end of the fuel line and pumped the bulb and gas flew out of the pump from several places. It is a new Sierra pump.

 

[Cofe]

Re: J10rena idles great but possibly floods out one cylinder. Why?

That don't sound good. Did you buy the pump locally?

 

[78 mckee]

Re: J10rena idles great but possibly floods out one cylinder. Why?

To properly check the fuel pump, after you remove it from the block you need to reinstall the mounting screws with nuts on the back to seal the pump halves as it would when mounted on the block. Otherwise, fuel squirts everywhere when you pump the bulb.

 

[ba_50]

Re: J10rena idles great but possibly floods out one cylinder. Why?

After putting a couple of nuts on it didn't leak out the back but did out the cap screw. It didn't do that before. Hate these pumps!

 

[78 mckee]

Re: J10rena idles great but possibly floods out one cylinder. Why?

As long as it's not leaking out the back, it's not flooding the cylinder. The leaking from the cap is probably from over pressurizing with the primer bulb. The pump is fine so you have eliminated that from the list of possible causes.