I'm wondering what I might have done wrong to make the gauge start acting up. I'm no mechanic but I can twist a wrench. A girl has to do what a girl has to do. I get the feeling I'm gonna have to drop the tank again...sigh.
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Re: replaced fuel pump now gas gauge is screwy
The sending unit sends a signal to the engine control module. The engine control module sends a serial message to the fuel gauge.
Check the connection at the fuel tank. If you have a digital multi-meter, check the resistance on the "purple" wire at the fuel tank connector, fuel tank side. The amount of resistance will be determined by the amount of fuel in the fuel tank. Generally it should be between 10 and 255 ohms.
Below is the wiring diagram for your car. Hope it helps, let me know.
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Most cars have a strainer before the pump inlet and a inline external fuel filter. some have the filter and pump as one unit installed in the tank. the fuel gauge and float are attached to this unit . it is possible that the pump relay may be on the way out.
you can put the pipes on the wrong way but the pressure would popped something some were as it is not a pressured line its just a return line. also it would back feed as there is a none return on the intake line. there were test's done on a few common makes of cars just to see what would happen if this was done. and it turn's out on a old engine there was no problems engine would run but over time the engine would fail as the pump was sucking instead of pumping, now it was a different story for egr engines as it would pump fuel out of the exhaust engine would run but it was ruff.and as the egr would get to temp it would catch fire. so on injection engines it was made clear witch way the fuel lines are some models have a 8mm line for the fuel line to pump and a 10mm line on the return. but as the pipes get older they stretch and can be mistaken so you would need to look to see witch line the filter is on to pump out, now this was ok doing it this way but to save money in making the car they used unfit parts that fit other cars and other models. so now the pump out are the same size and a part of the pipe goes to a joint where it changes from 10mm down to 8mm intake line. so would check to see witch line is on what from the pump.
had these same indications on a v8 range rover from new. Turned out to be a rotating main bearing shell opening the oil hole to the crank (low pressure) then closing off the hole ( high pressure). I would be having a mechanical oil gauge fitted ( service mechanic ) to eliminate any bearing fault. I would also be replacing the oil pressure sender unit. as a precaution
incorrectly and half assed installed. putting a fuel pump in a chevy is very difficult and takes patients. most mechanics dont have that so go to another shop and make sure they fix the problem before you pay.
instrument cluster is just for monitoring. but on modern cars there can be integrated circuits to calculate the actual amount of fuel inside tank. so sender sends signals and dashboard decodes it and show the amount on gauge.
which car do you have? if it is a later model with such system you may need to reset related software to match with new sender unit on pump or floater. (dealer can do this for you)
for example if you have a new daylight driving lights(LKM) controller on new BMW's if you replace it with a new one you need to code it to match with your car. if not it wont operate correctly.,
But there is an exeption. when sockets are broken or connections are wrong, fuel and temp gauges act erratic. they jump, pulsate or dont work at all. before replacing anything more be sure that sender unit or whole asembly is the correct part for your car. second be sure that connection has been done correctly.
There is a fuse for the GAUGES, but if it was blown, nothing will work. If your Gas Gauge is acting erraticaly, the problem is most likely the Fuel Level Sending Unit, part of the Fuel Pump, unless you want to remove and replace the fuel pump, your problem will be there til then.
Note, the failure of the Sending Unit does not mean there is something wrong with the fuel pump.
It might not be anything wrong with your fuel sending unit. Keep an eye on your other gauges. I own a 2004 Pontiac Bonneville GXP. All of my gauges have started acting erratically. It started with my Temp. gauge, moved on to my speedometer, and now my oil pressure , fuel level and batty volt gauges are affected too. Its a very common problem with GM vehicles.
Your last sentence has me wondering, did u purchase gas for both vehicles at the same gas station? How far apart did u fill them up (same day, 2 days apart...) I am wondering if you got some bad gasoline. It would explain your problems and the coincidence of both vehicles giving u this type of problem. How about draining the gas out of the vehicle w/ the least in the tank, replace the fuel filter again add fresh gas from a different station. This is of course assuming your fuel pump is ok. When the gas is removed do u see any sediment? Any water would be at the bottom of the tank (gas floats on water) so u should check for water also. Let me know what u discover. good luck!! countrycurt0