[Kensey335]

Hello all!

I am new member of this forum and a long time viewer of e90 post. Recently, I have found myself in some troubleshooting issues and while I couldn't find it in the forum, I bet I'm not the first to have this issue and I'd love some input.

Before doing any modifications to my stock 335i n54, I was getting these DME codes on the MDH stage 1 tune:

2AAF - Fuel Pump, plausibility
2A2D - Fuel low-pressure system. fuel pressure

So I ordered and installed a Stage 2 Walbro 450 in-tank LPFP. After install, the car was running fine and I primed the pump for a couple days before doing pulls. BUT when I worked up to a third gear pull, the half engine light came on. This has been a consistent problem now for a few days now.

Now my codes are:

2A2D - Fuel low-pressure system. fuel pressure
2A87 - Exhaust VANOS (which I know is probably an unrelated issue)
3100 - Boost-pressure control, deactivation

Any suggestions on what to check next as far as the fuel pressure issue? Could it be that I need a new fuel pressure sensor? Has anyone else been here? I will take all the help I can get!

Thanks in advance!

[thisizaremix]

Curious what ended up being the issue on this?

Originally Posted by Kensey335

Hello all!

I am new member of this forum and a long time viewer of e90 post. Recently, I have found myself in some troubleshooting issues and while I couldn't find it in the forum, I bet I'm not the first to have this issue and I'd love some input.

Before doing any modifications to my stock 335i n54, I was getting these DME codes on the MDH stage 1 tune:

2AAF - Fuel Pump, plausibility
2A2D - Fuel low-pressure system. fuel pressure

So I ordered and installed a Stage 2 Walbro 450 in-tank LPFP. After install, the car was running fine and I primed the pump for a couple days before doing pulls. BUT when I worked up to a third gear pull, the half engine light came on. This has been a consistent problem now for a few days now.

Now my codes are:

2A2D - Fuel low-pressure system. fuel pressure
2A87 - Exhaust VANOS (which I know is probably an unrelated issue)
3100 - Boost-pressure control, deactivation

Any suggestions on what to check next as far as the fuel pressure issue? Could it be that I need a new fuel pressure sensor? Has anyone else been here? I will take all the help I can get!

Thanks in advance!