How do I check if my fuel pumps are working properly?

Asked by Feb 02, 2017 at 07:44 PM about the 2012 Toyota Corolla S

Question type: Maintenance & Repair

So my engine light turns on, I take my car
to a autozone and they tell me I had a
misfire on cylinder 2 so I bought a new
cylinder and a spark plug, turns out the
spark plug is burnt (which is normal my car
has 80k miles) so I put everything back
together and I turn on my car, the light still
on, I take m car back to autozone the next
day and they tell me the same thing, for
some reason I had a feeling all my spark
plugs were gonna be the same burnt, so I
went ahead and bought the other 3
replaced them, then the car still had the
light on, I took it back to autozone for a
third time and they gave me a paper of
reason of why the misfire was happening
and the fuel pump was one on them, I go
get on my car turn it on open the hood
disconnect the first fuel pump and the car
becomes weaker, then plug it back in and
it goes back to regular, then I disconnect
number 2 and nothing happens literally
nothing, I proceed to diconect #3&4 and
the same thing that happens with #1
happens, so can any of you guys tell me
how to find out which one is which? The
pump? Or the wiring?

2 Answers

251,065

Fuel pumps? You mean fuel injectors. If nothing happened when you removed injector #2, it might be clogged causing the misfire, have it cleaned. Use top tier fuel and you won't be having issues like this.

2 of 2 people found this helpful.
69,385

Unless you clear the computer using a scan tool the check engine light will not go off immediately after the repairs are made. The computer must run the diagnostics on the system before the light will go off. For most vehicles the diagnostic test must run and pass three times before the light will go off. This can take a few days. If the engine isn't shaking, especially on acceleration, chances are it's not misfiring. Wait a few days and just drive normally, like you always do. If the light is still on and/or the engine is shaking there's something going on. I doubt that a single cylinder misfire would be caused by a faulty fuel pump. HTH. -Jim

Your Answer

Corolla

Looking for a Used Corolla in your area?

CarGurus has 3,413 nationwide Corolla listings starting at $2,394.

Postal Code:

Toyota Corolla Experts

  • #1
    Tom Demyan
    Reputation
    2,450
  • #2
    tenspeed
    Reputation
    1,840
  • #3
    tennisshoes
    Reputation
    1,770
View All

Related Models For Sale

Used Toyota Camry
42 Great Deals out of 1,593 listings starting at $1,700
Used Honda Civic
307 Great Deals out of 4,113 listings starting at $1,494
Used Honda Accord
62 Great Deals out of 1,114 listings starting at $748
Used Toyota RAV4
61 Great Deals out of 2,888 listings starting at $2,999
Used Nissan Altima
70 Great Deals out of 1,275 listings starting at $2,750
Used Nissan Sentra
161 Great Deals out of 1,751 listings starting at $1,987
Used Hyundai Elantra
156 Great Deals out of 3,443 listings starting at $2,490
Used Toyota Tacoma
26 Great Deals out of 794 listings starting at $5,995
Used Mazda MAZDA3
167 Great Deals out of 2,577 listings starting at $2,250
Used Toyota Prius
162 listings starting at $4,995
Used Toyota Yaris
41 Great Deals out of 711 listings starting at $1,488
Used Honda CR-V
50 Great Deals out of 2,706 listings starting at $1,495
Used Hyundai Sonata
46 Great Deals out of 1,292 listings starting at $1,781
Used Chevrolet Cruze
198 Great Deals out of 4,321 listings starting at $2,900
Used Ford Focus
129 Great Deals out of 2,546 listings starting at $750

Used Cars For Sale

2016 Toyota Corolla S For Sale
33 listings starting at $15,994
2015 Toyota Corolla S For Sale
4 Great Deals out of 59 listings starting at $14,445
2014 Toyota Corolla S For Sale
19 Great Deals out of 167 listings starting at $10,998

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.