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david craig
david craig, Auto Mechanic
Category: Car
Satisfied Customers: 3301
Experience:  owner/mechanic at 3D Automotive
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I just changed the fuel pump and now the car won't start.

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I just changed the fuel pump and now the car won't start. The pump energizes when I turn the key to the run position.
JA: Is the car in "Park" or "Neutral?" Do you know if your car has a "wheel lock" feature?
Customer: the car is in park. I don't know if it has the wheel lock feature. It ran 20 minutes ago when I pulled the fuse to release the pressure in the fuel lines
JA: What is the model/year of your VW?
Customer: 2004 Vw beetle 2.0
JA: Are you fixing your Beetle yourself? What have you tried so far?
Customer: I have just replaced the fuel pump
JA: Anything else you want the mechanic to know before I connect you?
Customer: When I plug in my scanner to check the codes all it does is read error on the scanner.

Hi Im David, does the vehicle crank?

Customer: replied 5 months ago.

and you can hear the fuel pump run so do you have rpms when cranking?

Customer: replied 5 months ago.
It turns over at its normal rpm

you mean it cranks at normal rpm. do you have a scan tool that reads live data?

do you have a noid light or a fuel pressure gauge?

did you have the battery disconnected while replacing the pump?

Customer: replied 5 months ago.
I have plugge in my scanner for codes and all it reads is error after about 30 seconds
Customer: replied 5 months ago.
I didn't disconnect the battery

when you turn the key to the on position(not crank) does the check engine light come on?

Customer: replied 5 months ago.
It does

ok good

when you crank the engine does the theft light go out?

Customer: replied 5 months ago.
Not sure which light that is, the only light I see that I don't recognize is an epc light but none of them go off when I'm cranking

its either a blinking red light on the dash or a key symbol or the word theft or security

Customer: replied 5 months ago.

is that no you dont have any of those or no it doesnt go out?

Customer: replied 5 months ago.
None of them go out and I don't see a security light lit up

ok, if this thing was running before you replaced the pump and you didnt disconnect the battery then i will send you some fuses to check

please check the highlighted fuses

Customer: replied 5 months ago.
On 29, 7, and the 2 on the battery I show 12volts, on the others I don't show any voltage with the key on or off.

ok stand by

all of those fuses you arent getting voltage on , need to be pulled out and checked, then if good, they need to be checked with the key on and within 3 seconds of turning the key on.

Customer: replied 5 months ago.
Ok stand by.
Customer: replied 5 months ago.
28 jumped to 2 volts for 3 seconds. 43 jumped to 1 volt. 32 jumped to 11 volts. 34 jumped to 11. 7 jumped to 11.

ok. hang on a few

Customer: replied 5 months ago.

theres no way the fuel pump is running with the key in the on postion

if fuse 28 jumped to 2 volts, its impossible that the fuel pump ran

Customer: replied 5 months ago.
Ok. I hear something running in the back when I turn the key to the run position. It runs for 3 seconds.

that should be the fuel pump but you better check fuse 28 again

Customer: replied 5 months ago.
Re secured the ground on my meter and read 12 volts

check 43 again

Customer: replied 5 months ago.
43 jumped to 11 volts

I dont know what you did, but you you need to check the fuel pressure and check for spark

Customer: replied 5 months ago.
Those are the only things I can think of also.. I'm going to pull the pump and double check it just fo peace of mind.

i would just check the rail pressure and then check for spark

Customer: replied 5 months ago.
It's not building any pressure at the fuel rail

oh boy. then you're on the right track by checking the pump. make sure nothing crossed or pinched

Customer: replied 5 months ago.
When I disconnected the fuel line from the pump there was pressure in the line

a lot?

Customer: replied 5 months ago.
The lines at the pump were revearsed

nice......hey at least you found it

Customer: replied 5 months ago.
Was talking to a buddy in Germany who suggested it. Thanks for your help and have a great day.

please accept the answer and leave a 5 star rating for me if you were satisfied with my assistance. thank you. glad you got her my friend.

Customer: replied 5 months ago.
Not a problem I will do that.


david craig and 7 other Car Specialists are ready to help you

thanks brother

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