Low Fuel Pump Voltage At Fuse Box
10-01-2011, 04:55 AM
#1
AudiWorld Newcomer
Thread Starter
Join Date: Oct 2011
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Low Fuel Pump Voltage At Fuse Box
1999.5 A4 2.8Q
Car won't start. Turns over fine, but does not fire. Fuel pump was not running, so I ran power directly to the pump and it runs. Voltage at the fuse box for the fuel pump is 4.XX volts or less. Fuel pump relay tests good according to the service manual test procedure. Ideas Please.
Car won't start. Turns over fine, but does not fire. Fuel pump was not running, so I ran power directly to the pump and it runs. Voltage at the fuse box for the fuel pump is 4.XX volts or less. Fuel pump relay tests good according to the service manual test procedure. Ideas Please.
10-01-2011, 09:41 AM
#2
AudiWorld Super User
Contacts in the fuel pump relay are likely, unless there is a bad connection between the battery and relay, or relay to fuse. Have you tried taking the plastic cover off the relay, and buffing the contacts, for example with an alcohol-soaked piece of business card? If that's not it, disconnect your battery and measure resistance between positive battery clamp and your fuel relay's terminal 30, should be nearly zero. If Ok, then check relay terminal 87 to the pump fuse. One of those paths is where the high resistance is.
Thread
Thread Starter
Forum
Replies
Last Post
captain*chaos
A6 / S6 (C5 Platform) Discussion
11
07-23-2013 12:17 AM
