Jump to content

Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse

- - - - -

digital gas gauge problem

  • Please log in to reply
8 replies to this topic

#1 Guest_baccaruda_*

  • Guests

Posted 28 July 2003 - 08:49 PM

advice would be appreciated:

the gas gauge on the turbowagon (86, with digidash) takes a while, after filling up the tank, to register so. It'll think it's as empty as it was before i filled it, or it will catch up incrementally. this is accompanied in the trip computer as the same problem data as the gas gauge has, or by grossly overestimating the range (400 miles? i wish!) and then adjusting its overestimation downwards until it's accurate.

what should i blame for this first? sending unit? ECU? digidash itself? I replaced my digidash with this newer one a week ago but this problem existed before that so the dash wouldn't be first on my list..


#2 Guest_Caboobaroo_*

  • Guests

Posted 28 July 2003 - 10:42 PM

check your sending unit. I'm not very familar with the digidash but usually what happens is that the sending unit goes out, or is starting to show signs of wear. The gas gauge will A) not work if the sending unit is blown or B) will usually cause the fuel gauge to read inaccuratly if its not working right. From the sounds of it, it seems like the sending unit is on its way out because you also complain that the trip computer also is inaccurate. But I'm not for sure so you might also what to get a second oppinion.

#3 Guest_Flowmastered87GL_*

  • Guests

Posted 28 July 2003 - 11:13 PM

My 86 did this, not sure why, but I just used the trip odometer and used the guage for "a ballpark figure"

#4 Guest_rXSNRG_*

  • Guests

Posted 28 July 2003 - 11:15 PM

The digi on my '85 turbo was acting up, reading erroneously then eventually quit altogether and reads empty. I put in a sending unit that works and it did not fix it, then I slapped in a digi with a gas guage known to work and still no positive results. I'm guessing that I have either a bad ground or a broken wire some place, to lazy to track it down.

#5 Guest_baccaruda_*

  • Guests

Posted 29 July 2003 - 01:19 AM

well, neither of that solves my problem 8o but it still helps! :cool: thanks guys..
more opinions? anyone know of a good price on a new sending unit?
that involves taking up the carpet in the back of the car, etc, right?

#6 Guest_tomrhere_*

  • Guests

Posted 29 July 2003 - 04:00 AM

Be sure to check the wiring connector for the sending unit. Have had many that were corroded internally, but still looked good on the outside, my '86 for example. I just cut out the connector and soldered the wires together, using some heat-shrink tubing to cover the splices. Not sure where the ground is for the sending unit, but would have that on the suspect list also. I have fixed many an errant gas gauge, by drilling a small hole in the outer edge of the tank lip, and attaching a new tank to frame (body) ground wire. use soldered on termial ends, and starlock washers between terminal ends and the metal of the tank and frame (body). Got to have good grounds on a fuel gauge sending unit. They work on resistance, more resistance equals more fuel in tank. Bad ground equals more resistance, but doesn't mean more fuel in tank. Just a few more things to ponder on.......Tom

#7 Guest_TomInCO2002_*

  • Guests

Posted 29 July 2003 - 07:59 AM

The gas guage basically just displays the information that is given to it by the sending unit. It sounds like the float in the gas tank is sticking, causing it to react slowly. On my car the digital dash died and the trip computer now shows the range as 0.0 all the time, regardless of how much gas I have. This tells me that it computes the range based on what the guage shows, rather than what the sender is sending. I would change the float in the gas tank first, then check the wires from the sender.

#8 Guest_Cougar4_*

  • Guests

Posted 29 July 2003 - 09:08 AM

Your problem may be in the tank. I think the sending unit is in a baffled area in the tank to keep the fuel level fairly constant. So when in a turn or stopping, the level stays close to the same. If the holes to the baffle area are plugged somehow this would cause your kind of problem.

It could also be the sender unit itself causing your problem.


#9 Guest_baccaruda_*

  • Guests

Posted 29 July 2003 - 04:26 PM

thanks all. i'll try grounding first as it's easiest.

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users