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My engine is propane and gasoline runs well on propane but hesitates wen switched to gasoline has a new fuel pump

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  • Porsche Master
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First thought is the mass air flow sensor as this wouldnt be used when its running on gas

Posted on Nov 06, 2010

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Check fuel pump


Is your battery adequate ... at 7 below? Normally, the fuel pump will engage when the ignition switch is first turned to the ON position - without starting the engine.
Does the starter motor turn over the engine?
Has your fuel gauge been malfunctioning?

Any water in the gasoline would freeze at -7, preventing the fuel pump from being able to function if the water / ice is in the fuel pump

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My flex fuel Fors f150 7700 series won't stay running when I switch it over to propane


presuming you have fuel in the tank, you need to check fuel pressure. Or first physically check you do not have pinched fuel line and fuel filter is new for propane as well as propane pump is working correctly.

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Fuel filter first thing to check after having contaminated fuel removed. Clogged fuel injectors, crank or cam sensors.

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1998 malibu can hear fuel pump wen switch is on but wont start as long as we put fuel in top of motor it will run till itruns out could it be relay on fuel pump changed filter


the fuel pump will run for 2 secondes with key on to prime system. then when you crank engine it should run all the time. you check fuse and if current go to fuel pump at tank connector. if there is current then the fuel pump must be defect.

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1992 buick trembles and sputter wen im driving and in park and the belt sqeaks wen it happens


Don't know if squeak is significant or not. But I would have the fuel pressure checked. The hesitation could be from low pressure in the fuel rail. How is your fuel filter?

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2000 Dodge RAM 1500 Van, Hesitates and misfires after initial startup


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1 Answer

2002 Yukon Hesitation when starting- No checking engine lights!!


This can be fuel pump related or just fuel filter related, spark plugs and injectors.
When engine is cold vaporization of gasoline is minimum. When fuel vapor is less than required and the fuel mixture is not ideal, ignition happens harder than it does under ideal running conditions of engine. When fuel pups is sweak, or filter is limiting, or fuel injectors are not injecting gasoline with improper pattern inside engine, or just becasue of corroded spark plugs, cold engine faces difficulties during first ignition.

PS: sometimes car starts and stalls.it fails to start once more. this can be a sign of broken crank position sensor. FYI.

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1 Answer

I have a 1995 camry and it drives fine for about 30 mins, then it starts to hesitate more and more until it just wont drive. It always cranks fine but it will go a few feet and cut off...any ideas?


Fuel Pump is bad or going bad.
The Fuel Pump Motor does heat up. As a bad Motor also does, when it heats up it starts failing.
When it does this (fail), go to the Fuel Port located near Fuel Rail located in the engine compartment. The Injectors are off the Fuel Rail. The Port should have a Cap on it. Remove this Cap. It should look like a tire tube air port. Using Goggles for eye protection and having plenty of paper towels to catch fuel spill, and a rag to cover the opening to prevent accessive spray: depress the stem of the Port. If Gasoline comes shooting out, while the person is cranking the engine then the Fuel Pump may be okay. However I do not believe you will get much gasoline out of this.
Of course to cover the Fuel Pump Warranty you will have to install a new Fuel Filter.
Let me know if this helped, or if you have additional information or questions. Feel free to contact me at FixYa.com!

Jan 20, 2010 | 1995 Toyota Camry

1 Answer

Engine hesitates upon exceleration


Does it hesitate when climbing a hill, too? Might be a fuel pump or fuel pump filter. Suspect these components when an engine stalls or hesitates when more gasoline is required.

Sep 24, 2009 | 2001 Dodge Neon

1 Answer

Water in gas tank how do i remove it


Disconnect battery,remove the tank and drain it.The fuel pump is no good now too,replace it with new.After draining the tank,let it air dry for several hours so that ALL the moisture has dissipated.After reinstalling fuel tank with new pump,safely disconnect a fuel line up at the engine and place in a container.Add new clean gasoline,and cycle the ignition switch on and off so that the fuel pump will come on and flush the fuel lines of old contaminated gasoline and water.After a thorough flushing,replace the fuel filter with new.Also,add a small can of "Dry Gas" to the fuel tank as this will take any remaining moisture out of the tank.Good luck.

Sep 13, 2008 | 1996 Mitsubishi Eclipse

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