Fuel Pump Whine?

Elan

Hello forum! I may have a slight problem. I tried searching, but it was really to no avail. The only thread I found was this one and it wasn't that helpful. Fuel Pump?

Anyways, I have a very high pitched whine coming from behind the drivers seat (it's a very faint/hard to hear ringing). I thought it was the ECU but glove box is silent. I know its the fuel pump judging from the origin of the noise. It only happens when the car is running (Not in the ON position) and when the engine is cold and/or it's cold outside. There is even an audible and louder whine that can be heard standing behind the car even from a few a feet away. It will eventually go away after the car has been driven or it's warm outside.

Has anyone else experienced this? Is it normal for some of the 09s or do I need to get it replaced? I am having my mechanic look at it in a few weeks but I am antsy and need some peace of mind. Thanks for any input.

Also car starts with no problems, smooth idle, no RPM dip so the pump seems to be working fine.

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TedB370z

Spark Knock noise?

I noticed that same issue when I was working on another problem, and it ended up being some funk stuck to the fuel filter in the fuel pump assembly. If you scroll down about half way on that first page, you'll see the pics of what it was, and another link to how to remove the fuel pump assembly.

Taking out the fuel pump is fairly easy, just be sure to take out the fuel pump fuse in the fusebox hidden under the plastic cover next to the battery under the hood to de-pressure the fuel system....

SouthArk370Z

Check out some of the ESCL/SLU fuse removal DIYs for instructions on how to get to the IPDM (Integrated Power Distribution Module, IIRC).

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Elan

I'm glad you managed to find a fix. I'm thinking that may my issue as the pump seems to be working fine. I'll have to pull it out when I have some time this weekend.

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2009 370Z NISMO #477 | AAM Competition Short Tails | AAM Competition HFCs | K&N Typhoon CAI | Kenwood DPX300U | Rockford Fosgate PRIME R300-4 | Rockford Fosgate Punch P165 | Rockford Fosgate Punch P300-12 | Polk Audio db1001 | 15% Tints | GTR Start Button |

megalapagas

This is a total different question but sort of relavent, I noticed on my fuel meter it just keeps 8 dots lit up meaning I have half a tank but recently my car sputtered and died because I needed fuel, how I can fix the problem so my vehicle can read how much gas I have??

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Elan

Could be the fuel pump or a faulty indicator.

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2009 370Z NISMO #477 | AAM Competition Short Tails | AAM Competition HFCs | K&N Typhoon CAI | Kenwood DPX300U | Rockford Fosgate PRIME R300-4 | Rockford Fosgate Punch P165 | Rockford Fosgate Punch P300-12 | Polk Audio db1001 | 15% Tints | GTR Start Button |

megalapagas

Omg nissan is going to chop a leg for that if it is a fuel pump....how can check if the indicator isn't working?? Or do I have to go to the dealer for this

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GTM 34 Row Oil Cooler | K&N Drop Ins w/ Z1's Post MAF Tubes | F.I Non-Res'd 2.5" T.P w/ CF CBE | Axis Wheels | Piecing together My Own Custom T4 Top Mount Single Turbo Kit *Still in the works* |

TedB370z

the Level indicator on the fuel pump assembly is easy to clean if its dirty (follow that fuel write-up on how to remove the entire assembly), but remember there's another sub-level indicator behind the drivers seat as well (see pic), same basic instructions for removal. Did you try a can of Seafoam just to get the funk out?

Attached Images

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TedB370z

You can pick up a fuel pump assembly off of ebay... this is the same seller (I believe the same donor 2011 Z as well) I bought my coil packs off of...

11 Nissan 370Z Fuel Pump Assembly 170401EA0B R19260 | eBay

megalapagas

Damn Thanks!! I'm going to tey the Sea Foam first just incase and if not then ill get working on cleaning the Fuel Pump Assembly seeing as the dealer will just bend me over ...

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megalapagas

Also noob question but on the picture the rectangle looking thing, that's a gas tank right???

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GTM 34 Row Oil Cooler | K&N Drop Ins w/ Z1's Post MAF Tubes | F.I Non-Res'd 2.5" T.P w/ CF CBE | Axis Wheels | Piecing together My Own Custom T4 Top Mount Single Turbo Kit *Still in the works* |

phunk

If this happened after just taking a very hard right turn, and if it took less than 19 gallons to fill the tank afterwords, than you have experienced the notorious 370z fuel starvation. This happens when a hard right turn sloshes all the fuel to the driver side of the tank (while the pump resides on the passenger side). There is a large hump in the middle of the tank that does not allow fuel on the drivers side to naturally make it to the passenger side where the pump can get it.

If the car was truely out of fuel and it took 18-19 gallons to fill it back up, than you have a bad level sensor.

There are 2 level sensors, one for each side of the tank. They are potentiometers that are wired in series. Think of your fuel level gauge as a voltmeter. Voltage is passing through both the sensors in a series, their resistance lowers the voltage changing the display on your fuel level gauge indicator.

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megalapagas

Very Imformative Phunk Thank You! Ill fill the tank just to make sure if my fuel didn't go to my driver side then if not well ill get to replacing the fuel assembly

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GTM 34 Row Oil Cooler | K&N Drop Ins w/ Z1's Post MAF Tubes | F.I Non-Res'd 2.5" T.P w/ CF CBE | Axis Wheels | Piecing together My Own Custom T4 Top Mount Single Turbo Kit *Still in the works* |

phunk

Since there are 2 level sensors in the tank, you will want to test them and figure out which one is bad. If the sensor on the driver side is the one acting up, than replacing their entire fuel model on the passenger side wont help anything.

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megalapagas

So I have to replace the Whole Assembly PLUS the Fuel Pump or just the Assembly Iteself??

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GTM 34 Row Oil Cooler | K&N Drop Ins w/ Z1's Post MAF Tubes | F.I Non-Res'd 2.5" T.P w/ CF CBE | Axis Wheels | Piecing together My Own Custom T4 Top Mount Single Turbo Kit *Still in the works* |