1996 audi a4 fuel pump
10-29-2014, 05:29 PM
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1996 audi a4 fuel pump
I have a 96 audi a4 I have had some problems with lately the fuel pump went out so I bought a new one drive it 2 days then it would not start back so I thought it may have had been a relay so I bought a new one of them and still did not fix problem then I bought a ignition switch and still did not fix it when car sits over night or for a little while will not crank fuel pump wont kick on I can prime fuel pump with car battery and plug it back up and it will fire up and run I have been workin on the for couple weeks now and need to get it fixed asap need help thank
10-29-2014, 06:55 PM
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10-30-2014, 09:05 AM
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That still did not fix my problem I am really confused I have never seen nothing like this I am get 12 volts to relay and fuse and to the plug to fuel pump but why is the fuel pump not kicking on its brand new I have ordered another thanking maybe that I have got a bad one any help is appreciated thanks
10-30-2014, 02:27 PM
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That still did not fix my problem I am really confused I have never seen nothing like this I am get 12 volts to relay and fuse and to the plug to fuel pump but why is the fuel pump not kicking on its brand new I have ordered another thanking maybe that I have got a bad one any help is appreciated thanks
10-31-2014, 05:19 AM
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10-31-2014, 05:56 AM
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please clarify no start
If the starter engages but the car does not start due to the fuel pump not operating then search the C5 forum as well. There have been discussions about this over the last couple of years. Many similarities in the cars.
If the starter does not engage this is also a somewhat common issue. Search B5 for this.
10-31-2014, 01:34 PM
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Sorry, I missed the replaced relay. Re-reading your first post I am confused as to your symptoms. Are you saying the starter engages but the car does not catch or run? Or are you saying the starter does not operate?
If the starter engages but the car does not start due to the fuel pump not operating then search the C5 forum as well. There have been discussions about this over the last couple of years. Many similarities in the cars.
If the starter does not engage this is also a somewhat common issue. Search B5 for this.
If the starter engages but the car does not start due to the fuel pump not operating then search the C5 forum as well. There have been discussions about this over the last couple of years. Many similarities in the cars.
If the starter does not engage this is also a somewhat common issue. Search B5 for this.
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10-31-2014, 02:09 PM
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The starter works the car will run if u prime the fuel pump and when I say prime I mean hook the fuel pump straight to the car battery let it run and plug it back up and crank it and it will crank back but after it sits over night turn the key on and fuel pump will not kick on for some reason if u can help out with this thanks
Maybe I am alone but your lack of punctuation makes this more difficult.
10-31-2014, 06:21 PM
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The fuel pump on these cars will only prime for a couple of seconds when you first turn the key to the 'run' position from cold. Once it has done that, it switches off and will only run again during cranking of the starter and then will run continuously once the after start relay triggers - it's a safety feature.
So how have you tested the fuel pump during a cold start?
The fact that the car runs after a hotwire prime of the system is making me think you may have injector leak-down rather than a fuel pump or supply issue.
Is the car making oil?
Is there a smell of petrol on the dipstick or through the dipstick tube?
Is the engine trouble free once you get it started?
If you have injector leak-down, you'll want to fix it, as it will be washing one or more cylinder walls and thinning out the oil.
So how have you tested the fuel pump during a cold start?
The fact that the car runs after a hotwire prime of the system is making me think you may have injector leak-down rather than a fuel pump or supply issue.
Is the car making oil?
Is there a smell of petrol on the dipstick or through the dipstick tube?
Is the engine trouble free once you get it started?
If you have injector leak-down, you'll want to fix it, as it will be washing one or more cylinder walls and thinning out the oil.
10-31-2014, 07:19 PM
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The fuel pump on these cars will only prime for a couple of seconds when you first turn the key to the 'run' position from cold. Once it has done that, it switches off and will only run again during cranking of the starter and then will run continuously once the after start relay triggers - it's a safety feature.
So how have you tested the fuel pump during a cold start?
The fact that the car runs after a hotwire prime of the system is making me think you may have injector leak-down rather than a fuel pump or supply issue.
Is the car making oil?
Is there a smell of petrol on the dipstick or through the dipstick tube?
Is the engine trouble free once you get it started?
If you have injector leak-down, you'll want to fix it, as it will be washing one or more cylinder walls and thinning out the oil.
So how have you tested the fuel pump during a cold start?
The fact that the car runs after a hotwire prime of the system is making me think you may have injector leak-down rather than a fuel pump or supply issue.
Is the car making oil?
Is there a smell of petrol on the dipstick or through the dipstick tube?
Is the engine trouble free once you get it started?
If you have injector leak-down, you'll want to fix it, as it will be washing one or more cylinder walls and thinning out the oil.
