Those Blue O-rings (see 1st pic) that seal these parts to the tank (both sides) must be kept dry of gasoline. The manual says they should be replaced whenever you open the tank this way. If you are ordering these senders I suggest you order a couple O-rings at the same time, wipe the area of gas, and try to keep them dry (they react by expanding).

The fuel pump snaps to the 2nd sender (arrow in 2nd pic shows one of the snap points). The manual suggests using one of the old O-rings to help keep these "clips" open as you extract the fuel pump from the sender. Also be aware that there is about a cup of gasoline in the pump which will pour out if you tip it...

Good luck!

 

So i'm getting the upper entire part of the fuel pump assembly? I thought it was just the arm and i snap in the arm somehow. Getting the entire unit would be nice (minus the lower part of the fuel pump).

Yea the gaskets are coming with. The driver's unit is a common item that works on a lot of other cars like the M35/M45, its our fuel pump one thats G35 specific. I got them ordered, just no clue when i got time to play with this again in the near future.


$22x shipped, 2 fuel sending units and 2 gaskets.

 

What I have founded out about these sensors. The design is not good because it gets stuck on the fuel pump filter. I have had to take mine out a few times to correct this problem. I personally think the sensor goes bad it is just super touchy. Especially if you are driving over speed bumpers or zipping around curves/corners. It also seems to be the one where the fuel pump that goes bad. I haven't changed mine yet because I feel like buying a new sensors will not correct the problem. Good luck

 

Yes, I believe what you ordered is the sender without the fuel pump. If you grabbed that service manual I pointed to previously, on page FL-8 they describe how to separate the pump from the sender. Not too difficult, and it all snaps back together.

Gradyboi, it's a bit awkward to get it all in and out of the tank and you have to be sure not bend the arm or tweak the sweeper part in the process, but the float arm should be completely clear of the filter. In the second pic where he is holding the whole unit, the float is at it's lowest position (empty tank). From there it swings up and away from the pump so should never be any closer to the filter than in that pic.

 

TurTLe,
I appreciate your posts!! Got exact same issue, pulled both units, cleaned the metal/electronic sensors sweepers with the floats. Re-installed and No Love! =( I'm thinking it's the gauge in instrument panel. Car runs out at 1/2 tank. Fill up with 18gals, needle goes a bit above Full, slowly descends to 1/2 as I drive while I mind my mileage - 400 miles. ANY LUCK WITH YOURS???

 

Have had a similar issues with my 03 coupe and 05 sedan. I currently have the sedan and the gauge reads fine until half and starts to go wonky. It will drop to empty and put the gas light three times before I know I have to get gas. Terrible guessing game. Can we get a clear list of parts that should be replaced over time related to the fuel system? Infiniti told me to replace both my sensors, my car currently has 175k km.

 

Again I believe it is almost always a problem with the senders on our Gs. The "cleaning" operation some have had success with here is not an official repair. It works for some, sometimes temporarily, and it doesn't work at all for others.

You know how a volume control on a stereo can get dirty and scratchy sounding? That is a potentiometer and what you're hearing is dust or crud in the sweeping area. Now think about that potentiometer unsealed and mounted inside your gas tank. It is BOUND to get contaminated and/or simply degraded by the caustic nature of gasoline.

Sadly, this design was not made to last very long and I believe the only fix is to replace both sender units as TurTle* plans to do. Hopefully that will resolve the problem, at least for another 7 years / 60k miles...

 

Well i got one sender/sensor and it didn't work....

They sent me a different sensor for the driver side one... So i gotta wait for another one.

 

You mean wrong part or non-fuctioning? Driver's side and passenger side are not the same (obviously because one snaps onto the pump...) Did you get one correct and one not?
Drag...

 

wrong part. New part should be here today.

The pass side is already installed and nothing has changed.

 

Hmmm, then we're gonna have to assume it was your driver's side that failed first. But look at it this way - both "sweepers" are built the same way and both have been in your gas tank for the same amount of time. So, if one has failed then the other would likely be on the way out...

Sure hope this second sender solves the problem...

 

oh i understand this logic completely.

the second one came in, but wont have time to install til the weekend, well i do have time to install but i cant afford screwing up and not going to work morrow.

 

Son of a.... installed both today and NOTHING has changed.

I'm going to fill up later and hope it just takes a little time but its not looking good...

What else can it be? Think the cluster is bad?

 

Oh man..... This is extremely irritating.
I've pm'd you.

 

The junkers that are most likely good..

I'm going to run a few tanks of gas thru and hope for the best.