Question about 2000 Lexus ES 300

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Car idles rough and when u hit the throttle it starts to backfire

Replaced fuel pump filter pressure regulator?

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  • Mike Butler
    Mike Butler May 11, 2010

    More details, better description please.

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There is an Idle control sensor that has likely gone bad, take it to a trusted mechanic or dealer and have them replace it to solve the problem--roughly $300 repair at a Toyota dealer

Posted on Mar 05, 2009

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Posted on Jan 02, 2017

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1 Answer

If it's a fuel pressure problem,could it be the filter?


fuel pressure problem could be the pump the flow filter in the pump or the filter on the line. if the fuel pressure is ok before the fuel regulator and not after the regulator then the regulator can be the problem, fuel filter in the tank around the area the pump is hit the bottom while the engine is not running this can sometimes push the tank sediment out of the pump filter, fuel filter this would need replacing, its recommended to change them around every 2 to 3 years. regulators, they dont really go wrong but if they do its usually from much getting to the regulator, via a damaged filter, you would need to remove the regulator and back flush it with the regulator in the open positing some are electric and some are vacuum feed. usually if the take feed is slow and it blocks at the tank then replace the fuel filter 2 to 3 times, as the pump can pass the muck into the filter over time.

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I've got a 1996 jeep grand Cherokee with the 5.2 v8 fuel injected Holley throttle body. My problem is while driving at soft or low acceleration it accelerates fine, but if you hit the throttle hard it


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IF YOU HAVE FUEL FILTER WITH FUEL PUMP ASSEMBLY YOU HAVE TO REPLACE FUEL PUMP ASSEMBLY REMOVE THE REAR SEAT BENCH IN ORDER TO REPLACE THE FUEL PUMP ASSEMBLY. NOW IF YOU HAVE FUEL PRESSURE REGULATOR AND FUEL FILTER AS ONE UNIT.BECAUSE FUEL PRESSURE REGULATOR BUILT TO THE FUEL FILTER.TO REPLACE FUEL FILTER, FIRST DEPRESSURIZE THE FUEL SYSTEM BY REMOVING THE FUEL PUMP RELAY LOCATED ON THE COWL.THEN CRANK ENGINE UNTIL IT DIES LACK OF FUEL.THE CRANK ENGINE OVER FEW TIMES TO MAKE SURE ALL FUEL OUT THE FUEL LINES.LOCATION OF FUEL FILTER UNDER THE VECHICLE MOUNTED TO THE LEFT SIDE OF THE CHASIS.

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1 Answer

Low fuel pressure on neon 2003,have change fuel pump,but pressure is low can start if tank is full


Hi.

Check the fuel filter and fuel pressure regulator. They are part of the same assembly and are located on top of the fuel pump. To replace the regulator # Disconnect fuel supply line at the Filter/Regulator nipple and releas locking spring tab (2 in diag.) on the regulator, then turn counterclockwise and pull out. To test regulator use a gauge like this in fuel lines:Pump Pressure Tester.
Pressure in 2003 should be 58psi (48 in 2001 engines). Pressure will drop of about ten psi when you start engine.

There is also an automatic shut down relay ASR. If problem is the ASR the pressure will go down when the relay cuts off power to pump. Read voltages and see if the problem is electrical first before going for the regulator.

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