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New fuel pump doesn't work

Tiny
GLORIA HOWARD
  • MEMBER
  • 2003 VOLKSWAGEN JETTA
I have a 2003 VW Jetta my gas gauge was working but after my mechanic put in a new fuel pump now it doesn't work. What happened?
Wednesday, March 23rd, 2011 AT 9:53 PM

11 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
It's possible he might have left the fuel sending unit unplugged when he replaced the pump.I would call him and complain and tell him your gas gauge doesn't work anymore and that it did before he changed the pump or it could be the relay check out the location and guide below.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please run this test and get back to us.
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Wednesday, March 23rd, 2011 AT 9:59 PM
Tiny
J.STIEG
  • MEMBER
  • 352 POSTS
  • 2001 VOLKSWAGEN JETTA
  • 150,000 MILES
Can you tell me where the fuel pump relay location is on a 01 jetta VRS 2792cc.
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Friday, May 29th, 2020 AT 1:09 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It's on the fuse panel and thirteen panel box. Pic enclosed.
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Friday, May 29th, 2020 AT 1:09 PM (Merged)
Tiny
J.STIEG
  • MEMBER
  • 352 POSTS
I don't see the distribution box like the one you posted. I see one small box it has one relay three empty spots for relays.
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Friday, May 29th, 2020 AT 1:09 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It's under th left side of dash
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Friday, May 29th, 2020 AT 1:09 PM (Merged)
Tiny
EXOVCDS
  • MECHANIC
  • 1,883 POSTS
Here's a location picture from a New Beetle... same place as the Jetta.

https://www.2carpros.com/images/external/94612d1341338212-car-died-while-driving-98-nb-dash.jpg
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Friday, May 29th, 2020 AT 1:09 PM (Merged)
Tiny
J.STIEG
  • MEMBER
  • 352 POSTS
I have replaced lots of in tank fuel pumps before. But was just wondering if this VRS jetta has a fuel pump in the tank?
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Friday, May 29th, 2020 AT 1:09 PM (Merged)
Tiny
EXOVCDS
  • MECHANIC
  • 1,883 POSTS
Yes, under the passenger rear seat. Can be checked via current ramping
to see what the pump current demand looks like.
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Friday, May 29th, 2020 AT 1:09 PM (Merged)
Tiny
EXOVCDS
  • MECHANIC
  • 1,883 POSTS
Tap on the bottom of the gas tank (palm of hand, don't go nuts)
while someone is cranking the engine.

If she starts, pump has a worn spot.

Thomas
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Friday, May 29th, 2020 AT 1:09 PM (Merged)
Tiny
J.STIEG
  • MEMBER
  • 352 POSTS
That's easy just lifting up the rear seat wish they were all like that.
Pulled out pump, checked out fine, put every thing back together runs good. Its possible there was a dead spot in the motor or a loose crimp.

When ever there is a problem with something that has a relay involved I always start troubleshooting there first, to see if the problem is upstream or downstream.
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Friday, May 29th, 2020 AT 1:09 PM (Merged)
Tiny
EXOVCDS
  • MECHANIC
  • 1,883 POSTS
Yes, dead spot on contact area for brushes. If you had no power at
the pump, then it would be a relay / power supply issue.

Have a shop check the waveform of the current to determine if there
is a dead spot.

The next time she doesn't start, tap on the bottom of the tank to
jiggle the pump motor to a good contact. Might not always work.

Thomas
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Friday, May 29th, 2020 AT 1:09 PM (Merged)

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