95 s10, new MFI = Hydrolock

QueTipp · #1 11-13-2006, 08:43 AM

Hey everyone, this is my first post here. I need some help with a 95 chevy s10. It is a Vortec engine and I replaced the MFI fuel injector and the 2 fuel lines that go to that.
Everything went pretty smoothly while I was replacing the Injector, but when I tried to start the engine, it turned a couple of times and then the engine would no longer turn. I have diagnosed that one of the cylinders is filling up rapidly with fuel and is causing hydrolock.
My question is, why do you think that the one cylinder is filling up so fast with fuel? It's a brand new fuel injector, so the only thing I can think is that I put the poppet in wrong or maybe you guys can offer a suggestion?

Thanks

QueTipp · #2 11-13-2006, 08:56 AM

Also, I've seen you guys refer to this injector as a CPI. Didn't want to cause any confusion.

BlazerLT · #3 11-13-2006, 12:41 PM

Quote:

Originally Posted by QueTipp

Guys, I had to replace my CPI as well. I did this over the weekend. I replaced the nut kit also. I am having a problem with one of the cylinders getting flooded out with fuel now. It causes hydrolock. I had to remove the spark plugs to push the gas out of the cylinder. Does anyone have a suggestion as to why the cylinder would fill rapidly with gas with a brand new CPI unit?

You didn't put the o-rings on the nut kit where it goes into the CPI injector.

Remove the plenum cover and see what you missed.

That or you have no spark.

Chris Stewart · #4 11-13-2006, 08:11 PM

When you get through, have somebody just turn the keyswitch ON...(don't try to start the motor) while you observe the CPI and fuel lines to check for a leak before you put things back together.
Check that the injector to the flooding cylinder is still on it's injector line.
After flooding that hard, you'll need to change the oil again before starting the engine.

Pro's/Anybody/Everybody...can you check the CPI injectors for squirt while the plenum is opened?

QueTipp · #5 11-14-2006, 09:11 AM

The o-rings were on the lines already when they came in the package. I took the fuel lines out of the CPI and put them back in. Then I engaged the fuel pump and there was no more leaking. I turned the engine over without the plugs installed and there was no more fuel spurting out. I hope this fixed my problem. I am going to finish up the rest of the job tonight with new plugs, new oil and filter. Thanks for the help.

QueTipp · #6 11-14-2006, 01:22 PM

anyone know where i can buy new bolts for the plenum?

Chris Stewart · #7 11-14-2006, 04:59 PM

Your local auto recycling center/boneyard should be full of them.

QueTipp · #8 11-15-2006, 09:24 AM

I got it up and running again. I guess I didn't secure the fuel inlet line tight enough into the CPI unit. Runs like a champ now. I also went with a suggestion in another thread and that was to drain the old oil and run it with new oil (for 10 minutes or so) and then drain again.

POST REPLY TO THIS THREAD