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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, May-17-2019, 06:54:41 PM   #1
drunkuncas
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Default Replaced my fuel pump. Fires, won't run. Pumping fine.

FU to http://www.m3forum.net/m3forum/showthread.php?t=607429

Pump primes, then squirts when cranking into a bucket.

Car fires once, then dies- exactly like it did before pump replacement.

Relay bench tested. No current codes, but my TPS has occasionally been giving me an EML when I punch it in a higher gear.

Ground on passenger side engine good.


Ideas?

Solved: Check your MAP

Last edited by drunkuncas; Sat, May-18-2019 at 01:48:21 AM.
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Old Fri, May-17-2019, 08:41:02 PM   #2
Texaz3
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Default Re: Replaced my fuel pump. Fires, won't run. Pumping fine.

If the car does exactly what it was doing before the pump replacement, why did you think it was the pump?
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Old Fri, May-17-2019, 08:41:29 PM   #3
terraphantm
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Default Re: Replaced my fuel pump. Fires, won't run. Pumping fine.

Resync your EWS.
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Old Fri, May-17-2019, 09:14:24 PM   #4
drunkuncas
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Default Re: Replaced my fuel pump. Fires, won't run. Pumping fine.

Quote:
Originally Posted by Texaz3 View Post
If the car does exactly what it was doing before the pump replacement, why did you think it was the pump?
Because the pump was only running when jumped. And the 119k miles.

Last edited by drunkuncas; Fri, May-17-2019 at 09:53:40 PM.
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Old Fri, May-17-2019, 11:15:02 PM   #5
drunkuncas
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Default Re: Replaced my fuel pump. Fires, won't run. Pumping fine.

Works with the MAF unplugged.
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Old Fri, May-17-2019, 11:28:05 PM   #6
eacmen
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Default Re: Replaced my fuel pump. Fires, won't run. Pumping fine.

Try cleaning the MAF. You might find that fixes the issue for a few weeks/months.

If cleaning doesn't work get new MAF. I would get it from FCP in case it dies again you'll get a free replacement.
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Old Fri, May-17-2019, 11:58:21 PM   #7
drunkuncas
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Default Re: Replaced my fuel pump. Fires, won't run. Pumping fine.

Quote:
Originally Posted by eacmen View Post
Try cleaning the MAF. You might find that fixes the issue for a few weeks/months.

If cleaning doesn't work get new MAF. I would get it from FCP in case it dies again you'll get a free replacement.
Damn. And $75 less than ECS
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Old Sat, May-18-2019, 12:54:15 AM   #8
nowanker
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Default Re: Replaced my fuel pump. Fires, won't run. Pumping fine.

Quote:
Originally Posted by Texaz3 View Post
If the car does exactly what it was doing before the pump replacement, why did you think it was the pump?


It's fun to imagine that all automotive techs are theivin', lyin', ignorant pieces of sh*t.
But sometimes.... It's cheaper to pay one of us to actually diagnose the problem for you.
Sorry for the rant, and sorry for your misfortune. Hope you can hit on the problem without too many more misses.
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Old Sat, May-18-2019, 02:47:59 AM   #9
drunkuncas
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Default Re: Replaced my fuel pump. Fires, won't run. Pumping fine.

Quote:
Originally Posted by nowanker View Post


It's fun to imagine that all automotive techs are theivin', lyin', ignorant pieces of sh*t.
But sometimes.... It's cheaper to pay one of us to actually diagnose the problem for you.
Sorry for the rant, and sorry for your misfortune. Hope you can hit on the problem without too many more misses.
I guess you missed the part where I stated that the original pump wasn't turning on with the car, but would only pump when jumped. No prime. No squirt when cranked. Nothing.

I'm in a bay between a guy who builds race cars, and a guy who wrenches at a high end German repair shop. Can you guess which one didn't know how to bench test a relay, and suggested my solution lay in buying parts to swap out?
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Old Sat, May-18-2019, 02:23:17 PM   #10
nowanker
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Default Re: Replaced my fuel pump. Fires, won't run. Pumping fine.

Not all techs are idiots, but not everyone who works in a repair shop knows how to think. If someone displays their diagnostic ignorance... maybe not the best source of advice?
Sometimes it is the best diagnostic strategy just to swap parts. Some components defy testing, or have intermittant failures that are hard to catch. Or they're know failure items that you might want to change anyway.
When that strategy is the only one a 'mechanic' knows... run away.
Good luck, let us know what you find!
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Discussing Replaced my fuel pump. Fires, won't run. Pumping fine. in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)