Engine 3.0: Fuel Cap Error

[Deleted User 38384]

Without going into the why, I've been driving for 20 mi now, two different trips without a diesel fuel cap on my Wrangler.

So yeah 20 miles in, and I've still not gotten any check engine light or codes thrown...

Has any of my fellow EcoDiesel owners ever gotten a code thrown for the fuel cap not being tight enough or loose?

I'm starting to get the feeling the cap is literally just there for debris protection.

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[Gregj]

I’m sure it is one of the emissions readyness tests, it will eventually notice that the cap is missing.
Gregj

 

[GtX]

I have not.
But also never left the cap in the cup holder.

 

[Deleted User 38384]

I have not.
But also never left the cap in the cup holder.

I figure that way if it does throw a code at some point, I have it with me.

 

[Grayhound]

So I damaged the lip of my filler neck when I removed the fuel discriminator. I was worried it would throw a code, but it has been more than a year, and I have not thrown a code for the damage lip.

 

[DEZELJP]

Just another bit of info...Older EcoDiesel in Grand Cherokee’s never came

with a cap just a door for protection.

 

[Deleted User 38384]

Well there you go, 100 mi with no fuel cap on the filler neck and zero issues. No codes, no lights, no nothing.

It's almost like it's a capless system like the Gen 2 and 3 1500 EcoDiesels have except it just happens to have a cap on it.

This definitely opens up my options for my goal to make my Wrangler into a capless fuel system. It basically already is one, now I just need to find a cap that works to protect the neck from debris only.

I have some ideas, but it really comes down to the 62 mm width of the filler neck.

 

[SargeDiesel]

Without going into the why, I've been driving for 20 mi now, two different trips without a diesel fuel cap on my Wrangler.

So yeah 20 miles in, and I've still not gotten any check engine light or codes thrown...

Has any of my fellow EcoDiesel owners ever gotten a code thrown for the fuel cap not being tight enough or loose?

I'm starting to get the feeling the cap is literally just there for debris protection. ?‍

The real damn question Tres is WHY in the hell do you still have the nozzle restrictor still in your fill tube ?

Now I want to hear "Why" the cap was off...

*I've never thrown a fuel cap code, but my cap is always on and aways tight.

 

[Deleted User 38384]

The real damn question Tres is WHY in the hell do you still have the nozzle restrictor still in your fill tube ?

Now I want to hear "Why" the cap was off...

*I've never thrown a fuel cap code, but my cap is always on and aways tight.

What exactly is a nozzle restrictor?
What is its purpose?
And how do I remove it if I wanted to?

I didn't notice any removable parts in the fuel filler area other than the caps.

 

[Wrangler man]

Ran into several nozzles that this restrictor prevented me from getting fuel. Would also like to know how to eliminate without prompting a Jeep Wrangler gremlin light display on my dash.

 

[phageghost]

"Missing fuel cap" errors are thrown when the ECU detects a vacuum leak that will prevent the EVAP system from working. EVAP collects gasoline vapors from the fuel tank and routes them to a charcoal canister and eventually to the intake manifold, to prevent them from escaping into the atmosphere and creating air pollution.

Diesel is far less volatile and generates negligible vapors (also why there's no vapor recovery nozzles at diesel pumps), therefore we don't have an EVAP system for the ECU to nag us about.

 

[phageghost]

What exactly is a nozzle restrictor?
What is its purpose?
And how do I remove it if I wanted to?

I didn't notice any removable parts in the fuel filler area other than the caps.

Ran into several nozzles that this restrictor prevented me from getting fuel. Would also like to know how to eliminate without prompting a Jeep Wrangler gremlin light display on my dash.

The trucker pumps have the bigger nozzles. In the jack cubby at the rear of the cargo compartment there's a funnel you can use as an adapter -- but it defeats the auto-off function in the nozzles so gotta be quick on your toes! Somewhere around here there's a thread with a couple different ways of removing the restrictor fairly painlessly. As mentioned above, since there's no EVAP system you shouldn't generate any codes doing this. However, you're now no longer protected from filling your tank with gasoline (by yourself or anyone you loan the vehicle to) which is the point of the nozzle restrictor in the first place.

 

[Wrangler man]

The trucker pumps have the bigger nozzles. In the jack cubby at the rear of the cargo compartment there's a funnel you can use as an adapter -- but it defeats the auto-off function in the nozzles so gotta be quick on your toes! Somewhere around here there's a thread with a couple different ways of removing the restrictor fairly painlessly. As mentioned above, since there's no EVAP system you shouldn't generate any codes doing this. However, you're now no longer protected from filling your tank with gasoline (by yourself or anyone you loan the vehicle to) which is the point of the nozzle restrictor in the first place.

The trucker pumps have the bigger nozzles. In the jack cubby at the rear of the cargo compartment there's a funnel you can use as an adapter -- but it defeats the auto-off function in the nozzles so gotta be quick on your toes! Somewhere around here there's a thread with a couple different ways of removing the restrictor fairly painlessly. As mentioned above, since there's no EVAP system you shouldn't generate any codes doing this. However, you're now no longer protected from filling your tank with gasoline (by yourself or anyone you loan the vehicle to) which is the point of the nozzle restrictor in the first place.

I've used the OEM funnel on those occasions. You're damn right you need to be quick. Experienced a diesel bath a few times. Unfortunately ran into a few service stations where they put the Gasser nozzle on the diesel pump which inhibited me from getting fuel. Only once did I use the OEM funnel in this situation and once again ended up with diesel in my socks. Fortunate enough I'm so meticulous making sure I only use diesel #2, pulling out the Hot Shots EDT and never loaning my Wrangler out I should be covered on the accidental. But an easy sure method of removing the restrictor would be much appreciated.

 

[Grayhound]

I've used the OEM funnel on those occasions. You're damn right you need to be quick. Experienced a diesel bath a few times. Unfortunately ran into a few service stations where they put the Gasser nozzle on the diesel pump which inhibited me from getting fuel. Only once did I use the OEM funnel in this situation and once again ended up with diesel in my socks. Fortunate enough I'm so meticulous making sure I only use diesel #2, pulling out the Hot Shots EDT and never loaning my Wrangler out I should be covered on the accidental. But an easy sure method of removing the restrictor would be much appreciated.

The best I saw was a pair of channel locks squeezing the lip and giving a 90 turn then pulling out the descriminator assembly. From there you can disassemble that from the filter neck andvreinstall your filter neck

 

[Tread4Lo]

The best I saw was a pair of channel locks squeezing the lip and giving a 90 turn then pulling out the descriminator assembly. From there you can disassemble that from the filter neck andvreinstall your filter neck

Where is this method talked about? I have read some of the other ones and they seem to have you removing the whole fill tube from the Jeep from under the fender.

It would be nice to get rid of it. I have been taking note of what pumps have the larger nozzle, but usually one side of the pump is standard and the other is the large.

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