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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 02-07-2015, 08:46 AM   #1
mvance30
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Join Date: Nov 2013
Location: NJ
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My Ride: 2002 325xi
recent starting trouble

recently (once the temp has dropped outside) sometimes my xi has issues starting. When i turn the key to accessory and let the fuel pump start up. (you can hear the the fuel go through the line) and pump the gas a few times it'll start right up. When I don't pump the gas it takes a little bit longer to start. I thought pumping the gas doesn't do anything on these cars before the cars are on. Am I right or does it do anything?
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Old 02-07-2015, 10:18 AM   #2
latitude39
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"pumping" the accelerator pedal is from the carburetor days. That would set the choke on a cold carb and squirt a bit of fuel from the accelerator pump. That doesn't apply nowadays with FI.

It sounds like your engine is turning over but just not starting right away? Have you checked fuel pressure?
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Old 02-07-2015, 11:37 AM   #3
mvance30
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Quote:
Originally Posted by latitude39 View Post
"pumping" the accelerator pedal is from the carburetor days. That would set the choke on a cold carb and squirt a bit of fuel from the accelerator pump. That doesn't apply nowadays with FI.

It sounds like your engine is turning over but just not starting right away? Have you checked fuel pressure?
I figured as much. How can I check that? nvm I googled.
http://www.pelicanparts.com/BMW/tech...mp_Testing.htm
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Old 02-07-2015, 01:26 PM   #4
White_Knuckles
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When the pump is energized it will make a sound but it pressurizes the rail in seconds on start-up. The classic pump failure is a starting condition where it starts - dies - starts -dies never fully starting. This indicates surging but not able to build steady pressure. So your question is how to test pressure? You need a proper fuel pressure gauge with fittings or adapters that tap the fuel rail test port. There is a specified pressure (in pounds) that's read at the gauge. You need to know proper use of these to not spray fuel in your face or create some other problem. The system is under HIGH pressure.

I'm pretty sure you're not hearing "fuel going through the line" unless of course you have super hero ears? When you shut the car off pressure is maintained on the fuel rail. When the car is shut off gas doesn't flow back into the tank where the line needs complete refilling on restart. Thing is, it could be many things causing delayed start-up and not fuel pressure related.

I recommend you don't start exploring fuel system diagnosis unless you're somewhat experienced with auto repair. Let a local independent shop perform tests after discussing the symptom with them. The filter and pump parts cost is around $500. Labor to test it would probably be a 1 hour minimum charge. Labor to replace them (pump/filter) 1-2 hours. This is an example of what to expect if there is a fuel issue not saying this is the problem. The pressure test recommendation is solid but just a starting point.
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Old 02-08-2015, 06:32 AM   #5
kmm111
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Originally Posted by White_Knuckles View Post
When the pump is energized it will make a sound but it pressurizes the rail in seconds on start-up. The classic pump failure is a starting condition where it starts - dies - starts -dies never fully starting. This indicates surging but not able to build steady pressure. So your question is how to test pressure? You need a proper fuel pressure gauge with fittings or adapters that tap the fuel rail test port. There is a specified pressure (in pounds) that's read at the gauge. You need to know proper use of these to not spray fuel in your face or create some other problem. The system is under HIGH pressure.

I'm pretty sure you're not hearing "fuel going through the line" unless of course you have super hero ears? When you shut the car off pressure is maintained on the fuel rail. When the car is shut off gas doesn't flow back into the tank where the line needs complete refilling on restart. Thing is, it could be many things causing delayed start-up and not fuel pressure related.

I recommend you don't start exploring fuel system diagnosis unless you're somewhat experienced with auto repair. Let a local independent shop perform tests after discussing the symptom with them. The filter and pump parts cost is around $500. Labor to test it would probably be a 1 hour minimum charge. Labor to replace them (pump/filter) 1-2 hours. This is an example of what to expect if there is a fuel issue not saying this is the problem. The pressure test recommendation is solid but just a starting point.
One of the best posts I've seen in a long time. Kinda made my morning actually... I fully agree with his advise.
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