|Register||FAQ||Forum Rules||My Replies||My Threads||Mark Forums Read||Auto Escrow||Auto Loans||Insurance|
|6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum|
|08-07-2011, 08:07 PM||#1 (permalink)|
Join Date: Feb 2007
Location: Bear River, Nova Scotia
iTrader Score: 0 reviews
Erratic Fuel Gauge
When driving on rough roads with lots of turns or on steep hills the fuel gauge on my '95 GMC Sierra bounces all over the place as the fuel tank empties although it stabilizes on smooth straight roads. Should I assume that the fuel level sensor is at fault?
1995 GMC 1500 Sierra SLE
Regular cab long box
Braided steel oil cooler lines
Remote-mounted FSD behind front bumper
|08-07-2011, 08:16 PM||#2 (permalink)|
That would be my first thought too. Mine acts crazy when it gets to a certain point on the gauge, but is usually quite accurate most of the time. The simple variable resistor used on the float assembly is usually the culprit. Until mine goes bad, I'll put up with a couple of minor defects.
96 K2500 Suburban Peninsular Diesel 6.5TD
3.73 gears, Heath Remote PMD, Heath Heavy Duty Lift Pump, Banks 3" downpipe, BD 4" exhaust, JK headlight booster kit,
Heath HP4 PCM, manual glow plug switch, vacuum pump eliminated
Gauges: fuel pressure, manifold pressure, and EGT in a 3 gauge pod, plus engine oil and trans. oil temp on top of the dash. Bilstein shocks and Hotchkis sway bars on the greasy side. High idle mod too. Grover 1510 (Firetruck) air horn. Four wheel disc brakes.
2012 Acura TL V-6 (280hp)
2006 Harley Springer Softail FXSTSI (already modded and putting out more power)
2002 Chevy S-10, step side, regular cab, 2.2 litre w/5 speed
1992 Chevy S-10, extended cab, 2.8 V-6 w/5 speed
|08-07-2011, 10:14 PM||#3 (permalink)|
Join Date: Mar 2011
iTrader Score: 0 reviews
Mine doesn't bounce around, but reads way over full for the first ~200 miles of the tank, then goes from actually reading full to almost empty in the next ~250 miles.
You can buy a new fuel sending unit for about $130 or so. It would be a good time to clean/replace or get rid of the tank sock too. (ensure you filter pre LP though)
-4" Turbo Back DE Exhaust
-FTB upgrade with SS -6an line from tank to IP
-Walbro FRB-5 LP with pre and post Wix Filters
-New Bosch Injectors (2200 psi)/Duraterm GPs
-Buddy's single tow tune
-RCD 6" lift kit
|08-07-2011, 11:41 PM||#4 (permalink)|
The flapper is erratic. It uses similar to the one in the toilet with that bulb flapper.
No need to change the whole sending unit. PMDCable sells the replacement to the flapper only. It is a magnetic units, that goes up and down. Still have to take out the tank and the FSU.
1995 GMC Suburban:
PMD in Bumper
4" Warpspeed Exhaust
KD LP/OPS Harness
Bosch Duraterm GP
Chevron's XLP Diesel Additive
|Thread||Thread Starter||Forum||Replies||Last Post|
|erratic fuel gauge||happyjack||Electrical||3||08-13-2010 12:47 AM|
|erratic temperture gauge||infinityforge||Electrical||0||12-04-2008 06:45 PM|
|fuel gauge fluctuations/ erratic||ratmax||Interior||0||02-21-2008 01:10 PM|
|erratic SPA boost gauge...||J M B||Interior||0||10-17-2006 08:57 AM|
|Erratic Temp Gauge||Hooky||6.5L Diesel Engine||5||03-13-2006 11:46 PM|