Hamis001
NAXJA Forum User
- Location
- Glendale, Arizona
Hello All!
Any help would be much appreciated in helping me resolving this issue! I've read and searched countless forums with no resolve. I have a 2001 Jeep Cherokee Limited. I don't drive it often. About 2 months ago I had the small emissions leak engine light code come on. I replaced the gas cap with a Jeep cap and reset the light. Came back on after a few cold starts. Now it has gone to a medium evap leak engine light code. I've had the system smoke tested, it came back with no leaks found. I have inspected all lines and rubber connections, and don't see any issues. The technician who did the smoke test said that since no smoke leaks were found it could be the leak detection pump or evap purge valve.
So here is where I'll add a little more info to see if it helps solve my issue before I go spending $200 on a LDP that isn't confirmed as the issue.
I understand that the fuel system is pressurized and tested for leaks by the LDP only when the vehicle is on a cold start, under around 90 degrees outside, and with under 85% full. Coincidentally, or not, I have noticed that when starting the vehicle under these same conditions I notice a very strong fuel smell coming from around my fuel filler cap, which is also the same area the fuel tank vent valve is. Also, if I open my fuel cap at that same moment it is smelling of gas it lets out a lot of pressure. Outward pressure, not inward, which I find odd since I read the LDP should only pressurize the tank by about .25 psi?
So here is my question. Is it possible that the LDP is broken and over pressurizing my fuel tank causing the fuel filler cap to vent or the fuel tank vent to open?
Is it possible the fuel tank pressure sensor is broken and causing the LDP to run longer than it should?
What else could be causing this fuel smell in that area that would not have been noticed during a smoke test?
Or am I crazy or stupid to think about all these possibilities and should just replace the LDP? :eeks1:
Any help would be much appreciated in helping me resolving this issue! I've read and searched countless forums with no resolve. I have a 2001 Jeep Cherokee Limited. I don't drive it often. About 2 months ago I had the small emissions leak engine light code come on. I replaced the gas cap with a Jeep cap and reset the light. Came back on after a few cold starts. Now it has gone to a medium evap leak engine light code. I've had the system smoke tested, it came back with no leaks found. I have inspected all lines and rubber connections, and don't see any issues. The technician who did the smoke test said that since no smoke leaks were found it could be the leak detection pump or evap purge valve.
So here is where I'll add a little more info to see if it helps solve my issue before I go spending $200 on a LDP that isn't confirmed as the issue.
I understand that the fuel system is pressurized and tested for leaks by the LDP only when the vehicle is on a cold start, under around 90 degrees outside, and with under 85% full. Coincidentally, or not, I have noticed that when starting the vehicle under these same conditions I notice a very strong fuel smell coming from around my fuel filler cap, which is also the same area the fuel tank vent valve is. Also, if I open my fuel cap at that same moment it is smelling of gas it lets out a lot of pressure. Outward pressure, not inward, which I find odd since I read the LDP should only pressurize the tank by about .25 psi?
So here is my question. Is it possible that the LDP is broken and over pressurizing my fuel tank causing the fuel filler cap to vent or the fuel tank vent to open?
Is it possible the fuel tank pressure sensor is broken and causing the LDP to run longer than it should?
What else could be causing this fuel smell in that area that would not have been noticed during a smoke test?
Or am I crazy or stupid to think about all these possibilities and should just replace the LDP? :eeks1: