Walbro 450 keeps popping 20a fuel pump fuse

EthanHayesN54

New Member
Sep 30, 2020
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So i just installed a walbro 450 in my 2010 335i and it keeps blowing the fuel pump fuse. It can idle and rev but after about 30-45 seconds itll blow and shut off
 

NoGuru

Captain
Jan 9, 2018
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Just North of Detroit
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BMW 335is
So i just installed a walbro 450 in my 2010 335i and it keeps blowing the fuel pump fuse. It can idle and rev but after about 30-45 seconds itll blow and shut off
Is there a question there or were you just telling us?

If you were looking for some advice, I would first ask Where did you get the pump from? Is it Authentic?
Is it wired correctly?

I run a 535 and 450 and never blew a fuse.
 

EthanHayesN54

New Member
Sep 30, 2020
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1
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Is there a question there or were you just telling us?

If you were looking for some advice, I would first ask Where did you get the pump from? Is it Authentic?
Is it wired correctly?

I run a 535 and 450 and never blew a fuse.
I got it from ebay i used the link from a YouTube video. Its the pump ending in 274. I used the install kit that came with it and spliced them with my factory wire/connector
 

NoGuru

Captain
Jan 9, 2018
1,206
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Just North of Detroit
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BMW 335is
Okay, just and FYI, there are a lot of Walbro clones on the market so I would try and investigate if yours is a true 450. (274 is the 450)

How are your "splices"? Super solid connection or ehh, could have been better?
 

EthanHayesN54

New Member
Sep 30, 2020
6
1
0
Okay, just and FYI, there are a lot of Walbro clones on the market so I would try and investigate if yours is a true 450. (274 is the 450)

How are your "splices"? Super solid connection or ehh, could have been better?
Not the best, I didn’t solder anything. Just used the supplied connections and put heat shrink over it
 

NoQuarter

Major
Nov 24, 2017
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Indiana, USA
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Z4 35is, 535xi, X5 35i
The 20amp fuse powers the EKP and the EKP powers the pump.

I would expect a proper functioning EKP to shut down and report and error before it just pulled so much current it blew the fuse.
 

EthanHayesN54

New Member
Sep 30, 2020
6
1
0
The 20amp fuse powers the EKP and the EKP powers the pump.

I would expect a proper functioning EKP to shut down and report and error before it just pulled so much current it blew the fuse.
Thats what i was thinking, i just put a new ekpm3 in and coded it correctly and all that stuff