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gauge problem

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Old 03-27-2014, 11:50 AM   #1
diptenkrom
 
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Default gauge problem

i have done some searching on this and other forums, but haven't found exactly my issue or a definite fix. i just got a 98 mustang 5 speed for my wife. there are some things i will have to get right before she is going to start driving it. i have a handle on some of them, but the gas gauge is not one of those.

it will sometimes work, and sometimes not. i put gas in and it went to about half tank, which should be correct as i only put in $20 from about empty. the gauge was steady for a few miles and then just dropped out to empty. when i start the car sometimes it will read, and other times it will not. seems to be right when it shows up, but usually doesn't show up... i would assume that the sending unit could be a problem, and i read something about high sulphur gas, but seemed to be from newer models. also read something about bad solders in cluster. all my other gauges work, but the odometer/trip meter. was wondering what i should check first, and where the sending unit/float is located.
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Old 03-27-2014, 01:04 PM   #2
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Sending unit/float is in the tank. Odometer/trip meter is run by a gear thats spun by the speedo, it commonly breaks apart. Latemodelrestoration sells a replacement, can't remember if americanmuscle does as well.
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Old 03-27-2014, 01:18 PM   #3
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I know sending unit is in tank. More direct, I guess I should ask how to access it. I don't really care about the odo, just don't want the wife running out of gas.
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Old 03-27-2014, 01:23 PM   #4
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Unless there is a trick I don't know about. it requires dropping the tank. (fun)
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Old 03-27-2014, 02:22 PM   #5
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Quote:
Originally Posted by Miss Ellie View Post
Unless there is a trick I don't know about. it requires dropping the tank. (fun)
Well that sounds significantly harder than I wanted it to. Guess I will start with the cluster. Never understood why they wouldn't put removable panels in the trunk or anything like that.
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Old 03-27-2014, 02:57 PM   #6
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Could always cut one........
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Old 03-27-2014, 06:54 PM   #7
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maybe Im wrong but not having a working odometer is a big illegal no no.
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Old 03-27-2014, 07:00 PM   #8
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Not illegal at all, there's a box on the title when you sell it to check that says
Odometer does not match actual mileage, buyer has been informed. Seller and buyer have to initial or something like that.

It's illegal to sell it without making it known to the buyer that's all.
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Old 03-27-2014, 08:28 PM   #9
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In SC they exempt it past 200k anyway. But yeah but here is a check box for "not actual mileage"
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Old 03-27-2014, 08:30 PM   #10
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BTW I pulled the cluster and cleaned, checked everything. Didn't make a difference.

Is the connector for the sending unit accessible without dropping the tank?
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Old 03-27-2014, 08:49 PM   #11
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Unfortunately no. It isn't.
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Old 03-30-2014, 10:02 AM   #12
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so, more reading and whatnot. looks like the 98 stang has a specific to itself fuel tank. along with that a special housing and pump. this special unit is only sold as a whole, not separate components. so then i have to go to the junkyard and hope to find a 98 to get the sending unit/pump assy because i am not spending $2-300 for a whole unit.

upon further reading i find that the SVT focus pump is an upgrade. specifically 03-05. a cross reference on autozone website tells me that the same pump is used on 05-07 escape and 04-05 freestar as well as some of the gas powered f-250 & f-350s. so it should stand to reason that if i go to the junkyard and pull a pump assy from a 98 and swap the other pump into it, then i would have a decent upgrade for a whole lot less...

btw for anyone looking at this - airtex SVT focus pump is Walbro made and autozone sells it for roughly $65. i usually shop advance, but they want $135 for it. (price match maybe)
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Old 03-30-2014, 09:08 PM   #13
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okay, not sure about other years, but the 98 in the junkyard and in my yard has a long enough wire from the car and pump to unhook it WITHOUT dropping the tank. it clips to the bottom inside of the rear bumper. harness was a bit hard to work with from dirt, but was clean on the inside.

so i took the unit out of the junkyard, and then i hooked it to the harness in my car with the sending unit arm in a few different positions. upon putting the ignition in the run position it moved the gauge to full, half, 1/4 and 3/4 positions as i placed it there by hand. i am debating getting a new SVT focus pump as there were no cars in the junkyard with the right pump while i was there.
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Old 03-30-2014, 09:08 PM
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