1995 Dodge ram 1500 4wd 5.9L

I replaced my fuel pump module. When removing the old one as I was removing the hose to the fuel tank rollover valve the nipple/plastic connector of the rollover valve that the hose connects to snapped off. I was being careful but not careful enough I guess. There was still a little connector left so I removed the rollover valve and installed it on the new module because the new module didn't come with one. It's the only thing the new module didn't have. So I reconnected the hose and I've driven it a few days and now I'm getting trouble codes 32 and 51. BTW I also replaced the O2 sensor with a brand new one. If that hose to the rollover valve is not connected well or has even come off will it throw out a code 32?? And 51??

 

32 is egr solenoid circuit, 51 is system lean at idle......

32 is going to be a separate problem, 51 may be a residual, from having low fuel pressure. Clear the codes, drive it, and see if anything comes back.

 

I cleared the codes and after a drive of about an HR non-stop the check engine light comes on again and I get codes 32 & 51 again.

 

What brand O2 sensor?

Have a look at your EGR system, make sure everything is hooked up, and nothing is melted.

 

I started to check the egr and when I turned truck on I can hear a very loud hissing coming from the area of the top of the gas tank but I can't find it. It's not something you have to listen for . The hissing is there!

 

Vacuum leak. That may be related to the code 51.

 

Are you sure the "hissing" noise isn't an electrical pump whine? They spin at a pretty hi RPM n it can sound something like a whine. Pull the gas cap n lend an ear, or use a stethoscope.

 

I started to check the egr and when I turned truck on I can hear a very loud hissing coming from the area of the top of the gas tank but I can't find it. It's not something you have to listen for . The hissing is there!

 

take the gas cap off, leave it off, start the pickup and see if the hissing noise is still there. Is it coming from the gas cap area now. Put a papertowel over the gas tank inlet n see if the towel is blown out or sucked in.