Fuel gauge & radio wacky... underdash ground??

[Matt Bachand]

Now my fuel guage is so far past empty (on a full tank) its pointing toward my speedometer... My radio is also turning off and on from bumps. Gotta be the underdash ground?? Fuel gauge has been sparatic for years, and i cleaned the ONE FSU ground I could find. Could never find the rear tanks FSU ground, seemed to tie in to the fronts..?

Where abouts is the underdash grounds?

 

[bison]

Matt,
there's one right beside the ADL conn on the dash frame,(pull lower cover)another one above the puter on the firewall.Might be others?
There's a frame to cab ground strap just underneath the heaterhoses at the firewall.[engine bay](real sweet one to get at)

 

[Matt Bachand]

Matt,
there's one right beside the ADL conn on the dash frame,(pull lower cover)another one above the puter on the firewall.Might be others?
There's a frame to cab ground strap just underneath the heaterhoses at the firewall.[engine bay](real sweet one to get at)

Thanks Bison, I was just in there by the 'puter' doing my VSSB, Perhaps I disturbed it. I am going to go find them soon. Just wanted a little direction to help, and you have it well. Ether.

 

[bison]

Ether,Yeah,jummy stuff,sends them into orbit,little bit of glow with it.KABOOOOM

 

[Matt Bachand]

 

[Rodd]

Are you sure your fsu hasn't come apart in the tank? Mine did what yours is doing and when I dropped my tank the fsu was all apart.

 

[Matt Bachand]

Are you sure your fsu hasn't come apart in the tank? Mine did what yours is doing and when I dropped my tank the fsu was all apart.

No I'm not sure, but I have been having problems 3 weeks after having a new tank and FSU installed. Teaches me for having someone else do something on my truck...........

Wanting to drop it to remove the suspected sock, but trying to wait till I have walbro and prefilter.... NO idea whats going on in there, in winter I showed out of fuel symptoms 11 gallons dep in my 22 gallon tank.... Havn't let it go down that low since. Suspecting crud in my sock, as blowing it relieved symptoms. I refill every 100 miles for the last 6 months. LOL, I have 2 tanks, 22 gallon, 25 gallon, and a 50 gallon transfer tank. I can only go 100 miles at a time, lol.



I cleaned the ground I found by the ADL OBD2 port, 2 wires, both black, factory lookin connector, screw driven in towards the rear, had to lay on back and undo, clean, redo, no different.


The radio going out on bumps today led me to believe its an underdash ground. Thats a new thing.

Fuel gauge always was sparattic for a long time, but now its pointing to 85mph, lol, going due west, WAY past empty. Tank is full.

I also have a rear tank FSU that is garbage.... Need to replace that too.


I'm almost out of the winter hole, so 100 here, 200 there will be easy in a month or so..............

 

[Matt Bachand]

Never found a ground above the PCM.

 

[bison]

unless they only there up to 95,i suggest you need glasses:smile5:

 

[Matt Bachand]

unless they only there up to 95,i suggest you need glasses:smile5:

Would it kill ya to open the glovebox of your 98 and take a look for me?

I do understand you may need to find a flashlight!