 Gas Gauge Inaccurate |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
  |
| stevend914 |
 May 16 2018, 04:55 PM
Post
#1
|
|
Member  Group: Members Posts: 376 Joined: 13-December 16 From: Saint Louis Member No.: 20,670 Region Association: Upper MidWest 
 |
On my trip back from Corpus Christi my gas gauge is not indicating correctly, shows 1/2 or 1/4 full after I've filled the tank...but the reserve light is operating correctly. I'm sure there's a thread on this but my search worked as well as my gas gauge
|
   |
 
|
| dr914@autoatlanta.com |
May 16 2018, 05:06 PM
Post
#2
|
|
914 Guru Group: Members Posts: 7,805 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
float is not returning to the top as the slider rod is corroded, remove the sending unit dismantle and sand the slider rod until the float runs up and down easily
QUOTE(stevend914 @ May 16 2018, 03:55 PM)  On my trip back from Corpus Christi my gas gauge is not indicating correctly, shows 1/2 or 1/4 full after I've filled the tank...but the reserve light is operating correctly. I'm sure there's a thread on this but my search worked as well as my gas gauge |
|
|
|
| r_towle |
May 16 2018, 05:08 PM
Post
#3
|
|
Custom Member Group: Members Posts: 24,560 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
|
well, could be a few things.
All require you to remove the expansion tank, and then the fuel level sending unit in the top of the tank (lots of little bolts) Could be: 1) sender electronics are bad (check with a multimeter) 2) float is cracked (get a new sender) 3) rod that float is on is crusty and float is stuck (clean everything) Test is if the float is bad by making sure there is no fluid iin it, and submerse it in water, look for bubbles. Rich |
 |
|
| r_towle |
May 16 2018, 05:10 PM
Post
#4
|
|
Custom Member Group: Members Posts: 24,560 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
|
George is watching, or Dave knows.
I forget the voltage range, but I seem to recall its .5 volts top to bottom that will change the meter when you test it with the multimeter. |
|
|
|
| Beebo Kanelle |
May 16 2018, 05:20 PM
Post
#5
|
|
Member Group: Members Posts: 248 Joined: 22-November 12 From: Houston, Texas Member No.: 15,177 Region Association: Southwest Region
|
Ahh yes... the humidity down here absolutely kills the slider / float movement. I always have a clean spare on the shelf...
The easiest method I have found to restore functionality is a good overnight soaking in CLR. No need for disassembly. Just shake it lightly a few times to insure the free movement of the float. Good luck. |
|
|
|
| stevend914 |
May 16 2018, 05:21 PM
Post
#6
|
|
Member Group: Members Posts: 376 Joined: 13-December 16 From: Saint Louis Member No.: 20,670 Region Association: Upper MidWest
|
OK, thanks. I just refilled the tank so I'd best burn some fuel before repairs.
|
|
|
|
| GeorgeRud |
May 17 2018, 08:48 AM
Post
#7
|
|
Advanced Member Group: Members Posts: 3,725 Joined: 27-July 05 From: Chicagoland Member No.: 4,482 Region Association: Upper MidWest |
Check the resistance on the sender as you move the float up and down. Should go from around 0 to 90 ohms. I’d agree that cleaning the sliders should correct your issue.
|
|
|
|
| Elliot Cannon |
May 17 2018, 11:22 AM
Post
#8
|
|
914 Guru Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None 
|
What I also do is re-set my odometer trip meter to zero every time I fill up. At 300 miles, I need to be looking for a fuel stop. (IMG:style_emoticons/default/biggrin.gif)
|
|
|
|
| HalfMoon |
May 17 2018, 12:07 PM
Post
#9
|
|
Senior Member Group: Members Posts: 828 Joined: 13-November 12 From: Shenandoah Junction, WV Member No.: 15,144 Region Association: MidAtlantic Region |
Had the same problem Did all the recommended stuff. Went as far as getting a new sending unit, only to discover my gauge was bad. Soooo, lesson learned? It's not always the assumed problem.
Check your gauge. Me, I had a spare one and compared the two (hooked up). My spare read dead on, the original? Same exact problem you've described. |
|
|
|
| Marv's3.6six |
May 17 2018, 12:18 PM
Post
#10
|
|
Actual member 7" Group: Members Posts: 695 Joined: 22-November 04 From: Huntington Beach, Ca. Member No.: 3,165 Region Association: Southern California
|
QUOTE(Elliot Cannon @ May 17 2018, 10:22 AM) What I also do is re-set my odometer trip meter to zero every time I fill up. At 300 miles, I need to be looking for a fuel stop. (IMG:style_emoticons/default/biggrin.gif) Plus 1 on this... I do the same. I just replaced the bladder in my fuel cell and the float tube on the sender is quite loose. Read "wiggly loose" Are going to R&R the sender: disassemble, clean, reassemble... hopefully that will work. I have seen a good thread on the 911 bird board about this. |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 16th April 2024 - 12:14 AM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.