Question about 1986 Volkswagen Jetta

1 Answer

Fuel pump How do i know if i need to replace fuel pump i have put in a new fuel filter but engine sounds really rough.

Posted by on

  • Mike Butler
    Mike Butler May 11, 2010

    Have a fuel pressure test done. Only takes minutes, shouldn't be too expensive. Dies it run rough at idle, down highway, all the time, poor acceleration, hard starting ? When was last tune-up/service.

    Carbureted or fuel injected, engine, it is an 86?

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 90 Answers

Hi the only reason you would need to replace your fuel pump is if it is not producing enough fuel preasure to run your engine.

Posted on Jan 29, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

I have a 1996 GMC Jimmy that was iddling very rough and code said cylinder 2 misfire check engine light was on solid. Replaced all plugs, wires, cap and fuel filter 1st of March 2013. It ran better for a...


Lets start at the beginning. Did anyone check fuel pressure before and after replacing the pump ?
Has anyone checked the fuel pressure regulator and the injector spider ? The 4.3w engine uses a spider with one injector that supplies all 6 cylinders. And it runs at 65psi or more.

Aug 05, 2013 | 1996 GMC Jimmy

3 Answers

2000 blazer runs rough and dies when gas pedal pushed to floor.


sounds like you need to change your fuel filter or you may need a new fuel pump relay

Jan 23, 2013 | 2000 Chevrolet Blazer

1 Answer

Rough engine sound


Have fuel pump out put checked lack of proper fuel pressure can cause a lean condition and would ultimately lead to spark knock the noise you are most likely speaking of

Jan 04, 2012 | 2001 Mazda MPV

1 Answer

I have been told that my 1999 Cadillac Deville may be experiencing hesitation and rough running because the fuel filter may need to be replaced. Are there any instructions for that?


First we need to check if really fuel filter is at fault for rough running. Open the bonnet and pull out fuel pipe from the engine. Put this pipe in a clean and empty clear bottle (so that you can see the pipe) and now switch on the ignition but do not start the car, just turn it on. See the flow of fuel, if its constant then rough running is due to something else and if your fuel filter is really clogged then petrol flow will not be constant. To change the fuel filter, get under the fuel tank and locate a plastic cylindrical component with two fuel pipe connected to it. This is fuel filter. Buy a new one and replace. Make sure you check the pipes for any fuel leakage after you have connected the new fuel filter.

Aug 17, 2011 | 1999 Cadillac DeVille

1 Answer

Hey guys .i have a 1990 chevy c2500. a while back it started running kinda rough when at low rpms... then it began blowing the ecm fuse after running for about 10 minutes, and the check engine light would...


First check and see if you have spark at the sparkplug if you do then you need to check your fuel pressure.It sounds like to me that your fuel pump has went out to lunch.When you turn your ignition on try and listen for the fuel you should here it for the first 2 seconds you turn the switch on.

May 06, 2011 | 1990 Chevrolet C2500

2 Answers

Ford F150 engine backfiring, running/idling rough


I Have a 1999 ford f150 4.6 that back fires and is just running really ruff when idling alot of nack fire a sord of like a pulse going on what is my problem?

Apr 16, 2010 | Ford F-150 Cars & Trucks

1 Answer

Rough idle and generally running terrible!


if idling rough sound like air in system.and your injection pump timing is off.

May 23, 2009 | 1999 Dodge Ram 2500 4WD

1 Answer

96 pontiac 2.4 4 cy sometimes runs fine other times runs rough and won't go above 40 with out really pushing it, what could be wrong


sounds like you have a fuel filter thats plugging up, when you start an engine it pressurizes the fuel filter and gunk that has settled gets pushed to the outlet, when you shut it down it depressurizes and the gunk settles again, so everytime you start you get and engine that sometimes runs good or sometimes runs bad until something in the filter lodges in a bad place and then it wont run at all. Im not sure where the fuel filter is, but i can find out if youd like, just let me know.
now another thing is the fuel pump may be beginning to fail, if you have an in tank fuel pump the filter may be there also, some rigs have a small filter with the pump and a larger more efficient one on the link. if you can get under the rig look for two or more 5/15 or 3/8 steel tube lines, usally mounted to the frame, running toward the front of the rig. an external filter will be probably mounted to the frame or in the engine compartment.
the fuel filter is where i would start.
if you can find it, see if you can take it off (engine not running), fuel filters have to go on one way, some have an arrow showing the direction of the fuel travel and some dont, make sure if you put it back on that you do it exactly as it came off.
once you get the fuel filter off, blow thru it in the direction of fuel travel and see if there is any resistance, if good there shouldnt be much, if there is, then replace it.
let me know how you make out and good luck
would apprecitate your feedback if you would please
thanks

May 21, 2009 | 1996 Pontiac Grand Am

1 Answer

Jeep will crank but not turn over without gas and rough idleing


Have your injectors, injector pump, fuel pump and filter checked. if you have a new motor, definitely check the fuel filter. Also, you could have a relay or sensor, have a tech put a diagnostic machine on it to check your electrical system.

Apr 13, 2009 | 1995 Jeep Wrangler

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

165 people viewed this question

Ask a Question

Usually answered in minutes!

Top Volkswagen Experts

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

yadayada
yadayada

Level 3 Expert

60792 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

Are you a Volkswagen Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...