Fuel Pump Reset! Help!

[xavi.ordonez]

Hi, I recently replaced the fuel pump on a 1997 Boxster and does any one know if you have to reset the sending unit because the fuel gauge doesn't work now.

[Loren]

Please do not double post - you already posted this in another thread. Please re-read the Board Guideline/Rules that you agreed to when you registered here.

Yes, if you replace the fuel pump or fuel level sensor the gauge/sensor needs to be re-calibrated using a Porsche PST2 or Porsche PIWIS tester.

[xavi.ordonez]

Please do not double post - you already posted this in another thread. Please re-read the Board Guideline/Rules that you agreed to when you registered here.

Yes, if you replace the fuel pump or fuel level sensor the gauge/sensor needs to be re-calibrated using a Porsche PST2 or Porsche PIWIS tester.

Thank You very much sorry for the double post. I won't happen again.

[RFM]

I do not know whether the car has EURO specs. or not. Recalibration is only needed, in some cases, on C4 and Turbo cars, in other words 4 wheel drive cars, at least for Euro. specs. cars. If so, i rather think of a mistake or failure during the installation of the unit.

[tholyoak]

As stated by RFM, the gauge should work upon hookup. To read accurately it may need to be calibrated as suggested by Loren, but the gauge should function from the get go if installed correctly.

-Todd

Edited February 26, 2010 by tholyoak

[xavi.ordonez]

Yes, the fuel pump level should work just after installation. I took the sending unit out yesterday and after careful examination noticed that the connections on the floter where not touching. After installing the new sending unit. Problem solved! The FUEL GAGE WORKS!!!jajajaja Now the pump doesn't work AND THE CAR WON'T START!!!! OMG!!!!

I didn't remove the fuel or disturbed the actual fuel pump on the bottom of the tank. Just strait foward disconection of the inside fuel lines and connector to sending unit. Actually i wanted to check that the floater was not resting on the inside fuel lines as suggested in Waye R. Dempsey "HOW TO REMPLACE THE FUEL PUMP"

I have checked the fuse and relay. They are fine.

MUST YOU DRAIN THE FUEL TANK TO ALLOW PROPER PRIMING OF THE PUMP AFTER IT LOOSES PRESSURE DUE TO DISCONNECTION!!!!!

Any suggestions!!!!

[Wayne R. Dempsey]

Indeed, you should not need to recalibrate the fuel pump level sender when you replace it with a new unit. I have done this quite a few times with no problems. The new units work flawlessly, as long as you don't get the hoses tangled up on the sending unit as discussed in my article.

-Wayne

[xavi.ordonez]

Indeed, you should not need to recalibrate the fuel pump level sender when you replace it with a new unit. I have done this quite a few times with no problems. The new units work flawlessly, as long as you don't get the hoses tangled up on the sending unit as discussed in my article.

-Wayne

Yes, but must you remove the fuel and just add 12 liters if you are replacing just the sending unit?

[xavi.ordonez]

New Update

I did not remove the fuel. but I did prime the fuel pump by bipassing the relay by connectiong the No.30 to No.87 connection for the fuel pump relay on the relay panel under the dash for 30 seconds. then I installed the relay back and the car started right up. I'm driving again.

[Wayne R. Dempsey]

Indeed, you should not need to recalibrate the fuel pump level sender when you replace it with a new unit. I have done this quite a few times with no problems. The new units work flawlessly, as long as you don't get the hoses tangled up on the sending unit as discussed in my article.

-Wayne

Yes, but must you remove the fuel and just add 12 liters if you are replacing just the sending unit?

I'm not sure where that requirement came from - if it's from Porsche, I'm not sure their reasoning behind it.

When replacing your fuel pump, I recommend that you empty your tank all the way regardless. It's very easy to do, I have instructions on how to safely do this in my fuel pump replacement article: http://www.pelicanparts.com/techarticles/Boxster_Tech/22-FUEL-Fuel_Pump/22-FUEL-Fuel_Pump.htm

Also, I do like to run the pump with some fuel prior to starting the car. It's good practice to fill and prime the lines prior to starting up. You can jumper the pump as described in the above DIY article in order to accomplish this.

I haven't heard of any Boxster "calibration" issues with new senders - I think the system / circuit is pretty basic, and very similar to how it is on the older air cooled cars.

Hope this helps,

-Wayne

[xavi.ordonez]

Indeed, you should not need to recalibrate the fuel pump level sender when you replace it with a new unit. I have done this quite a few times with no problems. The new units work flawlessly, as long as you don't get the hoses tangled up on the sending unit as discussed in my article.

-Wayne

Yes, but must you remove the fuel and just add 12 liters if you are replacing just the sending unit?

I'm not sure where that requirement came from - if it's from Porsche, I'm not sure their reasoning behind it.

When replacing your fuel pump, I recommend that you empty your tank all the way regardless. It's very easy to do, I have instructions on how to safely do this in my fuel pump replacement article: http://www.pelicanpa...L-Fuel_Pump.htm

Also, I do like to run the pump with some fuel prior to starting the car. It's good practice to fill and prime the lines prior to starting up. You can jumper the pump as described in the above DIY article in order to accomplish this.

I haven't heard of any Boxster "calibration" issues with new senders - I think the system / circuit is pretty basic, and very similar to how it is on the older air cooled cars.

Hope this helps,

-Wayne

Wayne thank you so much for all your help. Your article really help a lot specially on how to jumper the pump. thank you so much

[Wayne R. Dempsey]

No sweat! I'm a DIY enthusiast just like you!

-Wayne