I have a 2002 nissan sentra gxe it wont start replaced fuel pump under seat it ran good for two days now it wont start again it wants to but wont any idea whats wrong with it

Maybe in the engine compartment or near the rear seats under the car. Gas lines dont run into the car so just have to follow the lines and replace as needed. Some cars dont even have filters now. Its part of the fuel pump and when it goes you can it.

Part 1 -How to Test the Ignition COP Coils (Nissan 1.8L)

troubleshootmyvehicle.com > Nissan > 1.8L

Feb 12, 2013 - What Tools Do I Need to Test the COP Coils. ... coils (most commonly known as the COP ignition coils), on your 1.8L Nissan Sentra is pretty easy. ... When one COP ignition coil fails... that cylinder goes 'dead' due to a lack of Spark and is said to be misfiring. .... 2000, 2001, 2002, 2003, 2004, 2005, 2006 ...

Part 2 -How to Troubleshoot a No Start (Nissan 1.8L)

troubleshootmyvehicle.com > Nissan > 1.8L

Jan 17, 2013 - Checking for Spark With a Spark Tester. ... Your 1.8L Nissan will either have a distributor-type ignition system or the more modern COP ... A BAD fuel pumpwill cause your 1.8L Nissan Sentra to Crank but Not Start... since the ... Still, the other method that I've used to test for a lack of fuel... is spraying starting ...

2002 Sentra 1.8, no spark, code 0505... - Nissan Sentra Forum ...

www.b15sentra.net > ... > Technical Discussion

Nov 4, 2008 - 15 posts - ‎3 authors
I have never had a problem with the car before (02 Sentra 1.8/auto), so I had no need to post ... Originally Posted by Black B15 ... Join Date: Jun 2005 ... Can you see if the coilpacks are getting spark & work back from there? how many spark plugs do i need ? - Nissan Sentra ...
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Your reasoning is good.
It might not be the fuel pump or the camshaft sensor.
However, there are about 10 - 20 other things it could be.
God bless your efforts to find someone to diagnose this.

First you should check the fuel presure,that way you will notice there was somting wrong,fuel filter,plug on the line.

good day Sir, try to check the spark plugs and air filter, i hope this tips will help you.

around $400

Hello there:
no this is a intank fuel pump
Location: In-Tank Type: In-Tank, Electric, Direct OE Replacement Condition: New Part#: REPN314501 $70.00
FITS (ENGINE/CHASSIS)

1994: E; 4Cyl 1.6L GAS, FI, VIN "E", GA16DE;

1994: GXE; 4Cyl 1.6L GAS, FI, VIN "E", GA16DE;

1994: SE-R; 4Cyl 2.0L GAS, FI, VIN "G", SR20DE;

1994: SE; 4Cyl 1.6L GAS, FI, VIN "E", GA16DE;

1994: XE; 4Cyl 1.6L GAS, FI, VIN "E", GA16DE;

1994: Limited Edition; 4Cyl 1.6L GAS, FI, VIN "E", GA16DE;

good day Sir, your nissan sentra 1999 gxe have a timing chain this is some tips for your routine maintenance.
Replace engine oil
Replace engine oil filter i

The pump does have a filter on it but you should also have an inline fuel filter somewhere underneath your car, Check the pump when you turn the ignition key on the pump should run for a second or two then shut off if you can hear it , it is working. It is rare for a vechicle not to have an inline fuel filter but there are some models that don't have one. The filters on the pumps usually don't stop up that often,it's pretty rare.I would try to replace the inline filter call and ask your local part store if they have one for it and you will know for sure. And usually if the crank sensor is bad it won't crank at all.

good day Sir, try this link i hope this will help you

nissan sentra2002