Any Recommendation ( GAS Weird problem )

[Venditi]

Hi Guys
How are you all!!

I need some recommendation

One week ago I recently when to the repair shop to change my sending Unit & Fuel pump to fix my Fuel Gauge Problem, (In Fact the sending Unit comes already with the fuel pump in a complete piece, a kind of plastic cylinder).

Anyway I drove around the city a couple of days in order to fill up my gas tank. Everything worked well I even noticed my fuel gauge was going down slowly. Until this morning, its was very cold, I try to fill up my gas tank with no succes, Evertime the pump was stopping like if the tank was full.
I could not reach the 3$ mark to fill up my gas tank, I manage to try
3 different gas station. Then that dam freaking check Engine light came on.
Everything is ok with this Car, it start goods, A1 ...

I went back to my repair shop, actually they told me they do a check on it
Today , Finally they said it was a kind of check valve or something in the opening where you put gas that was the problems. They did not charge me nothing for it and the check engine light came off.

I will wait a few days now before Fill up. I will post update

Do you guys have any recommendation, tips, suggestion for a confuse Guy

Pontiac Grand Prix GT
126 500KM
Sending Unit and Fuel pump Change
outside Temp. during this problems -32 Celcisus


Regards,

[pidees]

I sure wish that I could help more but I am offering support and will listen to you blow steam if you need to.
I had an issue with my GP the other night. It ran out of gas and the gas aguge was not working. I checked to see the price of the floater thing that goes in the tank and a store told me that they only sell the unit package which is 300 smackeroos. I think I am just going to keep up with my mileage and go from there.

[Venditi]

Thanks for your reply

Did you fuel Gauge was working before? If no then you need to change all the sending units ( Fuel Pump & Floater) it comes all in the same pieces. It cost me 570$ Canadian Fund ( Gas Pump+Sending unit + Labour + Taxes. ) I dont recommend that you depend only on your trip reading cause if you get stuck in traffic then your reading will be wrong cause you dont make any distance.

I hope it help you.

Regards,

[BNaylor]

Originally Posted by pidees

I had an issue with my GP the other night. It ran out of gas and the gas aguge was not working. I checked to see the price of the floater thing that goes in the tank and a store told me that they only sell the unit package which is 300 smackeroos. I think I am just going to keep up with my mileage and go from there.

That is incorrect. You do not need to waste $300 plus for a complete fuel pump assembly to correct a fuel gauge problem. There is a fuel level sending unit kit which can be purchased for under $100.00. The part is GM dealer or AC Delco Authorized Parts Stores only. Easy DIY job too.


Here is one where just the sending unit/float was replaced.

[richtazz]

The problem happening right after a fuel module change makes me think they didn't get the vent lines connected properly. If the vent lines are tight, then the fuel tank vent valve located right next to the fuel module in the top of the tank (depending on the year of your car) may have been disconnected or is faulty. It's job is to vent air being displaced while filling the tank through the charcoal canister.

[pidees]

Originally Posted by Venditi

Thanks for your reply

Did you fuel Gauge was working before? If no then you need to change all the sending units ( Fuel Pump & Floater) it comes all in the same pieces. It cost me 570$ Canadian Fund ( Sending unit + Labour + Taxes. ) I dont recommend that you depend only on your trip reading cause if you get stuck in traffic then your reading will be wrong cause you dont make any distance.

I hope it help you.

Regards,

I never thought about getting stuck in traffic. Thanks for the help.

I alsowant to say thanks for all the input on my problem/situation.

[HiTekHick]

Originally Posted by Venditi

Anyway I drove around the city a couple of days in order to fill up my gas tank. Everything worked well I even noticed my fuel gauge was going down slowly. Until this morning, its was very cold, I try to fill up my gas tank with no succes, Evertime the pump was stopping like if the tank was full.
I could not reach the 3$ mark to fill up my gas tank, I manage to try
3 different gas station. Then that dam freaking check Engine light came on.
Everything is ok with this Car, it start goods, A1 ...

My wife ran into this problem just the other day. She went to 3 different pumps, and they kept clicking off like the car was full, and eventually she got one to work. She even got the gas station manager to help her and he was clueless.

[Venditi]

Originally Posted by richtazz

The problem happening right after a fuel module change makes me think they didn't get the vent lines connected properly. If the vent lines are tight, then the fuel tank vent valve located right next to the fuel module in the top of the tank (depending on the year of your car) may have been disconnected or is faulty. It's job is to vent air being displaced while filling the tank through the charcoal canister.

So the Vent line is the cause of this ridiculous problem!
How come the technicians did not look at that the second time I brought my car back ?
Where are they locate?
Can I untight them by myself?
Or I need to waste my time to go back the repair Shop?
I hope it will solve my problems.

Grand Prix GT 2001 127 000KM

[BNaylor]

You can check them DIY. The evaporative emissions line is the center one in the pic (right side). The two outer ones are fuel pressure and return. Just remove the 7 nuts holding the access cover located underneath the trunk carpeting. The area is located right behind the rear passenger seat in the trunk. You can use your fingers on the connector. The pressure sensor is the black object you see with the electrical connector on the top of the fuel pump assembly.

Another line is the vent line from the charcoal cannister to the fuel filler neck but you'll have to get underneath the car to check that.

[Venditi]

Thank for this nice picture!! I really appreciate!
Now I know where this is in my car.

What kind of visual sign I should inspect for what it causing my problem??
Bend hose, broking line,disconnected line or hose etc ...?

[Venditi]

Hi guys

I wanted to give you some updates on my Grand Prix weird Gas problems.

After a week of searching solutions for this problem. I still have the same symptoms with my car and It really drive me crazy. I call back my repair shop this afternoon and I need to leave my car there on thurdays. The manager of this place told me that he will definetely re-do the job. Still with the check engine light is on.

In the mean time if you guys know something about this
Please let me know.
Regards,

[BNaylor]

Originally Posted by Venditi

Still with the check engine light is on.

In the mean time if you guys know something about this
Please let me know.
Regards,

It would help to see what is triggering the SES/CEL light. Do you have any DTC codes we can go by? Most likely evaporative emissions type but you never know for sure.

[Venditi]

Sorry I dont have this informations right now.
But one thing for sure it happen after I repair my fuel pump and sending unit last week. check my first post
Regards,

[BNaylor]

Originally Posted by Venditi

Sorry I dont have this informations right now.
But one thing for sure it happen after I repair my fuel pump and sending unit last week. check my first post
Regards,

Oh yeah I recall that. Most likely related to that work done. If it is not the pressure sensor or one evaporative emissions line that feeds to the top of the fuel pump then it may be the big o-ring seal that seals the pump assembly to the top of the gas tank. Maybe they did not install it correctly or damaged it. Maybe even left it off?

[Venditi]

Thanks bnaylor for your amazing comments to help me to resolve this issue.
I will definetely mentione this to my repair shop this Thurdays.
I will post updates on the result as soon the repair will be done.
Hopefully I hope this time would be the last.
Thanks again
Ragards