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Service engine light comes on when gas tank 1/2 full

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The fuel level sensor located on the fuel pump is giving a false reading. You need to have the fuel level sensor replaced. or the fuel pump replaced. The sensor might not come seperately

Posted on Jul 18, 2009

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When tank is below 1/2 full the car is hard to start and when driving it seems to lose power. My check engine light does not come on.


the problem maybe a problem with fuel pickup at 1/2 tank, if the line has blockage, the filter is clocked up, the leveling or device that keeps track of fuel level is defective, there issue with the floater, the part that suppose to float has or full of fuel and when it gets to 1/2 tank, the floater full of fuel and sinks like your out of gas.
i think most likely clogged fuel filter in the fuel tank if your car has this type of system.
if not the fuel filter most of the time its near intake of the injectors, underneath the drivers seat under the car.
or by the inlet and outlet of the fuel tank.

Sep 08, 2015 | 1999 Hyundai Sonata

2 Answers

Gas gauge indicator goes to empty when full


sounds like you may have a bad fuel level sender problem. as for the check engine light coming on and storing a fault code that is a separate issue.

Aug 29, 2014 | 2005 Chevrolet Malibu

1 Answer

Engine malfunction indicator light


no year, no model, no joy. sorry.
the CEL .lamp means 1 of 2 things. (besides a serious problem)

1: take the car in for service, the PCM sees big problems.
2: SCAN it, connect any scan tool and scan it. see the errors.
then look them up in the FSM and see what is wrong, and what tests need to be done....

all cars. 1988 to now, same deal.

all this was in the operators guide, need one? lost it?

Mar 10, 2014 | Suzuki Cars & Trucks

1 Answer

Check engine light and gas light comes on


your fuel level sending unit in the gas tank is probably bad. mine has gotton so bad i have to use the odometer and just fill my gas tank every 240 miles. i just found a kit to replace the problem sending unit on e-bay for $38 so i am gonna give it a try.

Feb 19, 2013 | 2001 Isuzu Rodeo

1 Answer

I have 95,000 miles on my Grand Mercury LS car. Tonight my engine light came on with 1/2 tank of gas. I checked the gas cap (appeared okay - full tank fill up yesterday before my 175 mile road trip - no...


The check engine light is not a big cause for concern. Most of the time it relates to emmision controls or engine controls, but it will not die on you from one of these conditions. Simply get a auto parts store to pull the code for you and find out what is causing the light to come on. I know Autozone pulls codes for free, once you find out what is tripping the light we can go from there on fixing it. If you do manage to reset the light if the problem is still there the light will return. What happened earlier was the cars computer reseting and relearning the idle speed.

Mar 24, 2011 | Mercury Grand Marquis Cars & Trucks

1 Answer

Check engine light on. Took for service and


The check engine light can come on if there is watter in the fuel add some injector cleaner to a 1/2 tank of gas this will dry the watter in the tank

Jul 11, 2010 | 2005 Dodge Stratus

1 Answer

Service engine light on. Gas tank fills to 3/4 and clicks off. The model is XG350L 2004. The problem began about 2 months ago. It has been worked on once to replace a vacuum valve but still didn't fill up...


Did you have the fuel pump changed? They might of bent the electronic float assembly in the gas tank causing it to read 3/4 full.and making the check engine light come on.

Jan 16, 2010 | 2004 Hyundai XG350

1 Answer

Doesnt always start, but lights, radio, AC/heat does come on.


First place to check is the battery. Old ones can push your lights , radio, etc, but the starter is the real load. . Can verify this by using jumper cables to a running vehicle and watch your machine fire right up! The reason mornings are the worst, is the battery has had the most time to discharge, and it is probably cooler outside.

Dec 23, 2008 | 2000 Oldsmobile Intrigue

1 Answer

Jeep Grand Cherokee Service engine light soon on


A loose gas cap will sometimes trigger the service light to come on.  Since this appears to have happened on multiple occasions I can assume that this is not the problem but may be associated with it.  The level of gas in the tank affects the amount of atmospheric pressure in the tank. There are multiple things that could set off the light, one being a loose or defective gas cap, and the other is a fuel vapor return valve.  I'm not sure of the exact type of fuel system you have so I cant give a more exact answer.  If you wanted to give something a shot before bringing it into the shop, you can simply replace the gas cap first, a very cheap try. 

Dec 12, 2008 | 2002 Jeep Grand Cherokee

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