Question about 1993 Buick Century

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Engine won't run wthen fuel tank is 1/2 full

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Your fuel sensor that's in your tank may be broken, and may read 1/2 when really your empty. Could be the fuel pick up tube in the tank could be hung up somewhere and not on the bottom where it should be

Posted on Oct 28, 2012

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Posted on Jan 02, 2017

  • 19 Answers

SOURCE: My son filled up by 2001 volvo with a tank full of

Drain the fuel asap. Race fuel is not meant for a everyday car it will ruin the engine since its not set up to run on that type of fuel, its probably kicking a code to you engine due to this to make it run this way. If you drain the tank and then fill it with normal 87,89,91 octane gas you should be ok. Not too sure on how to drain the tank on that year Volvo.

Posted on Feb 19, 2010

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The weather or outside temp are not the issue at all

The truck either works correctly or it doesn't

The valve on the engine is called a Schrader Valve
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That is what you do next

It would seem from your description, that a check valve
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Driving in 105 degree temp, truck quits! What happened?


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Fuel Pump or starter. Since you say it's turning over but won't start I'd say it's your fuel pump. You'll probably have to drop your gas tank to fix this problem as your fuel pump is in the tank. You might be able to just loosen the straps and lower your tank a little to access it without removing the whole tank. Check around to local junk yards for this part and you'll probably find it for half the price as new. Make sure you can get your money back if the used pump doesn't work before you pay for it though. Don't forget to run fuel system cleaner (2 bottles to a full tank) once a month.

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Motor turns over won't start. Cleaned terminals, put in new battery, still won't start. Removed gas cap to vent air on hot day, still won't start. Lights all come on, all electrics appear to...


Your problem may be one of the following:
First check or just replace the fuel filter. Usually located under the car in front of the rear axle, drivers side.
Next, the fuel pump may be worn out. Usually they get loud or stop working (running).
Next, check the fuel pressure regulator. Usually located on the front fuel rail, drivers side.
Is the vacuum line attached? Not leaking or rotted?
Also, do you smell a strong fuel odor when it won't start? May be one or more stuck-open injectors, or the coil pack is bad.
Checking these in the order listed will more than likely fix your problem.
The clicking noise indicates the battery can no longer run the starter, which also means the fuel pump won't run either.

It could be a fuel issue. How old is the fuel filter? Can you hear the pump run for a few seconds when you turn the key on? Try turning the key to ON without trying to start engine three times waiting for the pump to stop running each time. Then try to start the engine. If it starts, Its a form of Vapor lock caused by the extreme heat we have had lately, and a weak fuel pump.

If none of this works, try a new fuel filter first. From there have someone check the fuel pressure regulator and then the pump. If you are in need of a new pump, take my word for it and spend the money to get one from a Dealer, and not from your favorite parts store. Most parts store parts are made in China and they are JUNK.

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Ford 2004 e250 after cleaning/removed battery terminal, won't start or engine won't running, fuel 1/2 full, this happen after disconnect +/- battery terminal remove.


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97 sl1 started stalling when 1/4 tank of gas now stalls at 3/4 tank replaced fuel pump and filter/regulator twice runs great when full


It seems that cap of the tank is not letting in air to replace the volume consumed by the engine. Earlier, when it used to stall when1/4 full, there must been less blockage of air but now the air inlet must be really clogged-up,so much so that after being emptied 1/4 of fuel, the negative pressure built up inside the tank is enough to negate the fuel pumps capacity & without gas it will stall the engine which is being deprived of fuel.
One way to make sure that this IS the problem, fill the tank half, do not put the cap try a drive at least for 5 miles & if the engine does not stall, then one can be sure that he cap of the gas tank has to be replaced............sodeep

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