Question about 1994 Cadillac DeVille

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Hesitation Car studders when attempting to accelerate. Was told it was fuel pump. Question is can the Pump itself be replaced into the existing assembly (Assuming the assembly is not damaged)??.

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Yes, but i'd replace fuel filter first.

Posted on Jan 06, 2009


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Hesitation when accelerate

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

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Abs light on 1999 mercury sable

Hesitation problems can be caused by a number of thing's on vehicle's with electronic fuel injection , not like the old days of carburetors where most likely it had a bad accelerator pump . Throttle position sensors (TPS) can get a worn spot that would act just like a bad accelerator pump . MAF sensors (mass air flow ) Can also cause Hesitation plus ruff running , bad fuel economy , a IAT sensor ,(intake air temp ) ECT - engine coolant temp. sensor can also cause this problem . Unless you want to replace all these parts i suggest you have it diagnosed by a qualified repair shop that has the electronic diagnostic tool to test it .
ABS light on , DTC- diagnostic trouble code could be set in the EBCM - electronic brake control module . could be a wheel speed sensor getting ready to fail .

Mar 21, 2017 | 1999 Mercury Sable

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Where is the fuel filter located on a 2005 Nissan Altima.....also, what are the symptoms of a bad filter or pump?

The fuel filter is located inside the fuel pump on a 2005 nissan altima. The fuel pump is under the back seat. You must remove the bottom cushion on the driver side. Before removing the fuel pump you must remove the negative battery cable and relieve fuel pressure. trouble with filters hesitation in starts could be some bogging and when acceleration poor fuel output but it depends on what ur car is doing?some of these same symptoms could be duel to idle air conrol valve controls idle and hesitation in acceleration

Mar 05, 2010 | 2005 Nissan Altima

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Bogging and hesitation on acceleration iddle is fine

You definitely covered most of the bases. Considering all you've done so far, I would check into the fuel system next. First, how old is the fuel filter? Has it been changed? Yes, a bad filter can cause the problems your having. Next would be the fuel pressure regulator. You need a fuel pressure gauge to check it, which you should be able to rent from a good auto parts store. That will also tell you how good your fuel pump is, i.e. if the pump can deliver the necessary fuel pressure off idle. After that, I would check the injectors themselves for wear or blockage. A bottle of fuel injector cleaner in the gas tank would be a good idea, cheap, quick, and it wont make anything worse. If all that checks out, check your catalytic converter, a clogged or bad cat will also do what your describing. Good luck.

Aug 02, 2009 | 2002 Buick Century

1 Answer

Car starts but turns off try starting car second time it will start with a little gas will run fine. it does this every time when starting car. was told that fuel pressure is low. car accelerates with out...

i would somehow either test the fuel pump and filter and replace the one that is not working, or replace them both. to test the filter you can try to take the filter off and blow through it. if no air comes out the other side, its clogged. for the pump, turn your key until it stops before the engine starts and listen carefully for a hum from by the gas tank. the hum is the fuel pump turnig on; if their is no hum, your fuel pump needs to be replaced.

Jul 19, 2009 | 1996 Pontiac Grand Am

1 Answer

Hesitation on takoff and on acceleration

it could be one of many things with that many miles on the vehicle. when if ever did you change the fuel pump last? both filter and pump may need to be changed. that's alot of miles remember that. the filter is under the hood on the drivers side mounted on the firewall. under the brake master cylinder. be careful to relieve the fuel pressure before changing it.

Apr 22, 2009 | 2000 Toyota Corolla

1 Answer

Hesitation on accelearation

Is the car giving you a check engine light? If so you will need to take it to a mechanic to check the codes. Some common causes of hesitation are:

Low fuel pressure - caused by a bad fuel pump or fuel pressure regulator

EGR valve - make sure the EGR valve is working properly. You can test it with a vacuum pump and make sure it holds air. Also you could have a plugged EGR passage.

Good luck and keep me posted. Thanks - Tech101

Jun 24, 2008 | 2001 Subaru Outback

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