Fuel pump connector

335is02

Corporal
Mar 10, 2018
113
45
0
Ride
2012 BMW 335is
Currently running 335is with two 450 walbro fuel pumps VS with a hobb switch for port injection.
Started having fuel cut off at about 5000 rpmon a pull. I drove car home and car starting bogging and giving fuel codes on my way home. After assuming fuel issue maybe hose was disconnected or something of that nature I noticed probable culprit.
My connector was melting at connection point and my hat was also begging to melt. Any ideas of what caused this? Pumps have about 1000 miles or less on them.
 

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JimboFresh206

Sergeant
Jan 29, 2018
289
152
0
Ride
335/635/535/533/633
Run a relay and trigger harness to new leads for one of the pumps. Your overloading it with 2.

Use this:

The connector and pins are available from BMW, use Realoem.com to verify against your Vin (I used mine) but it's located In the "fuel feed" tab.

29521
 
Last edited:

335is02

Corporal
Mar 10, 2018
113
45
0
Ride
2012 BMW 335is
Last edited:

scrllock

Sergeant
Dec 17, 2018
267
152
0
Ride
2011 335xi
Not familiar with the VS setup, I assume it runs one of the pumps off the stock EKP? Compared to my PR stage 3, that looks like the connector for the pump on the oem tophat connection. Which codes were you getting?
 

335is02

Corporal
Mar 10, 2018
113
45
0
Ride
2012 BMW 335is
Not familiar with the VS setup, I assume it runs one of the pumps off the stock EKP? Compared to my PR stage 3, that looks like the connector for the pump on the oem tophat connection. Which codes were you getting?
I don’t remember what codes I deleted them remember fuel pump possibility. Just today when I removed seat the top hat was slightly melted and connector.
 

335is02

Corporal
Mar 10, 2018
113
45
0
Ride
2012 BMW 335is
Not familiar with the VS setup, I assume it runs one of the pumps off the stock EKP? Compared to my PR stage 3, that looks like the connector for the pump on the oem tophat connection. Which codes were you getting?
Hey guys just wanted to update on this issue. It’s my ekp that was acting up and heating my wires. I redid the wiring and still was having issue with heat and when I ran the car pretty hard would start acting up ekp was overheating. Ordered the BPM4 should solve issue I will update once installed. Thanks again for the advice greatly appreciated.
 

doublespaces

Administrator
Oct 18, 2016
9,303
4,331
0
AZ
Ride
2009 E93 335i
Hey guys just wanted to update on this issue. It’s my ekp that was acting up and heating my wires. I redid the wiring and still was having issue with heat and when I ran the car pretty hard would start acting up ekp was overheating. Ordered the BPM4 should solve issue I will update once installed. Thanks again for the advice greatly appreciated.

You can always look at code history. Would be helpful if you're able to see what they were.
 
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