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Engine turns over but will not start ,fuel filter problem

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Your fuel filter could be clogged. Also, your fuel pump could be bad. turn the key, but do not start, and have someone listen by the gas tank for a short humming sound. It will only last a few seconds. If you hear nothing then your fuel pump is bad.

Posted on May 25, 2010

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4.3 v6 vortex 2002, the truck will not turn over, there is spark at the plug, and fuel and pressure at the valve on top of the engine. When I turn the key is starts but don't turn on. Just replaced fuel...


Most fuel injection systems use a ignition bypass circuit to energize the fuel pump when starting the engine. However, when the engine starts and the ignition key is returned to the "On" position, a Fuel Pump Relay keeps the fuel pump working. The relay may be defective.

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If it turns, then the battery is OK. Either spark plugs are not firing in proper order (wrong firing order), no power to spark plugs, or no fuel because of fuel restrictions (dirty fuel filter). Inspect the air filter to ascertain its not clogged air. If you smell gas, then you saturated the spark plugs, which is why it refuses to run.
Let it sit for half hour to let spark plugs dry. Inspect to ascertain its not dirty spark plugs, which will also prevent engine from running. After ascertaining its proper firing order, spark plugs are clean, and there's power to distributor cap, ascertain there's fuel in fuel lines by squirting half second (short squirt) of starting fluid into air filter. Close the air filter housing to trap flammable starting fluid gas. Turn engine without giving throttle. Let starting fluid be ignited by spark plugs. If it won't start, then spark plugs are not firing to ignite starting fluid gas. If it starts briefly, but won't run when you give throttle, but catches when a 2nd person squirts more starting fluid into air filter just before engine stalls, then its a fuel restriction issue or no fuel in fuel lines.

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1991 Miata Starting problem


find the filter pull it off and clean it if u cant clean it replace it they usally are cheap on older vehicles but with the filter off turn the car have someone turn the car to the on position so the pump is pumping and see how good it is coming out of the line if not very good then your gas tank line to the fuel filter is clogged but if its fine check the next fuel line the one on the fuel rail there is a bolt on the fuel rail crack it open and have someone turn the key if gas comes out then you are getting fuel and that would mean your injectors are bad

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94 chevy s10 4.3 engine wont start but it will turn over has fuel pressure and when you spray a little gas in the intake it cranks up but then stops


fuel starvation ie blocked filter /blocked pipe / as no fuel is reaching the cylinders
BUT FUEL IN INTACE AND STARTS BUT WONT RUN THIS IS BECAUSE THE FUEL BURNS AND STARTS THE ENGINE THEN STALLS AS NO FUEL CHECK ALL FUEL FILTERS AND FUEL LINE FIRST CHEAPEST OPTION

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1 Answer

Turn key to start-engine turns and i have spark wont start


I would check fuel pressure so you can rule out pump. I had a bad pump right out of the box before. Also you may want to change fuel filter so you can rule out plugged filter. You have spark, sure seems like still no fuel.

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1 Answer

Starting problems


Dirty fuel filter or faulty fuel pressure check valve which is located on your fuel pump sending unit. Try this test, turn the ignition on for 10 seconds (engine not running) then turn it off for 5 seconds and turn it on again then try to start the engine after 10 seconds. This will re-pressurize the fuel lines to start the engine, the fuel injectors need 62-65PSI to have them start the engine. Anything less then that and you'll have starting problem.
If it start's right up, then your ether have a fuel pressure check valve gone bad or a fuel leak at your fuel pressure regulator which is also common, but if your engine is still running 100% then i'll lean towards check valve or dirty fuel filter.

Start with the simple and replace the fuel filter, a dirty fuel filter will cause fuel restriction that may just be enough to the fuel pressure below 62PSI upon cold starts and a dirty fuel filter will cause the fuel pump to fail early in it's life.
Thank you for using Fixya and goos luck.

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1 Answer

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Replace your Fuel Filter and get the Fuel Pump Checked and you should be fine.

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MAY BE A VACUME LINE IS NOT HOOKED UP RIGHT

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