Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Help Fuel pump issue driving me crazy


Recommended Posts

Hey guys I am new here and really apreciate any help or tips given. My wifes 04 Cayenne S owned since new has gone through just about all of the common isuues known (coolant pipes, coils, drive shaft, rear main sea) and many more things in between to long to list. I just had the common stalling issues due to faulty fuel pumps or pump, what I decided to do was have all changed both fuel pumps and fuel filter. A week or two later car hit a1/4 quater tank of gas stalled again. I brought the car back to my mechanic who is great he did a check of the pumps and noticed that the passenger side pump only stays on for ten seconds when it should really stay on full time when the car has a 1/4 tank or less of gas. All relays and fuses are ok as well as sending unit . He seems to think that it could be a fuel leveling sensor.

Basic breakdown. 1/4 tank or less car stalls out it has new pumps please help

Link to comment
Share on other sites

The right side fuel pump is only on at certain times and never runs full time. Are you sure the cross over pipes to equalize fuel level on each side of the tank are fitted correctly? What is the fuel level in the left side pump module at 1/4 tank?

Link to comment
Share on other sites

The cross over fittings are all fitted correctly to the best of my knowledge. I am pretty sure my mechanic told me that they are all male and female different sized fittings. Basically car runs great until it hits a 1/4 tank then dies out. Should the car stay running when you disconnect the drivers side pump and leave it to run on passenger side, because it stays on but only for about 10 or so seconds. Thank you for your time and help

Link to comment
Share on other sites

  • 2 months later...

The cross over fittings are all fitted correctly to the best of my knowledge. I am pretty sure my mechanic told me that they are all male and female different sized fittings. Basically car runs great until it hits a 1/4 tank then dies out. Should the car stay running when you disconnect the drivers side pump and leave it to run on passenger side, because it stays on but only for about 10 or so seconds. Thank you for your time and help

Would you share with me how you did solve the problem?I got the pumps and filter replaced . runs great in the beginning even the idle drop problem is gone but..... I have the same strange feeling if fuel level goes lower the car is not running smooth. Thank you.
Link to comment
Share on other sites

The cross over fittings are all fitted correctly to the best of my knowledge. I am pretty sure my mechanic told me that they are all male and female different sized fittings. Basically car runs great until it hits a 1/4 tank then dies out. Should the car stay running when you disconnect the drivers side pump and leave it to run on passenger side, because it stays on but only for about 10 or so seconds. Thank you for your time and help

Would you share with me how you did solve the problem?I got the pumps and filter replaced . runs great in the beginning even the idle drop problem is gone but..... I have the same strange feeling if fuel level goes lower the car is not running smooth. Thank you.

It wound up being a faulty secondary pump purchased from the dealer.It was only at certain times car would die out or stutter. I replaced it with another new pump from the dealer all systems clear no issues.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.