[cway]

Hello,

I've been having issues regarding my low pressure fuel reading dropping as low as ~40 while getting above ~8psi of boost. Car has 17t's and is fbo.

Here's a log:

https://datazap.me/u/cway/logs/cmo98...=50x50&sc=3-21

For context I'm running a single walbro 450 on a stock ekpm.

Car has a consistent 72psi all the time until I hit higher boost levels.

I know this isn't sensor related as theres a huge crash in rail pressure and afr's go crazy. So I'm looking more at the EKP. I've seen some issues regarding the higher draws of the 450 pump and assuming the EKP can't keep up.

I have some questions about the best way to tackle this issue:

1. I've verified to the best of my ability that the fuel system is setup correctly, new in-tank regulator and PR fuel line as well. Is there something else that could cause this issue?

2. Will a properly coded ekpm3 alone resolve this issue? or is it wise to use an upgraded module?

3. I've seen talks about modifying the wiring to use the stock ekp for all of the signal/pwm control and then using a hardwire kit with a relay to provide power to the pump after receiving a certain signal from the ekp. I can't seem to find much info on this setup outside of the idea that it works well for dual setups as a way to turn the second pump on during higher demand with a hobbs switch. Does anyone know if this setup is viable for a single pump setup? I want to avoid running the pump at battery voltage 24/7 and wonder if this could be a way to do that.

I'm interested in seeing if theres a diy solution to this partial bypass, not to sound cheap but if it is possible to avoid spending $300-$500 on an upgrade I won't say no.

Thanks in advance for any input!

[flipmode]

How long have you been running this setup for? Its been fine until now?

[cway]

Originally Posted by flipmode

How long have you been running this setup for? Its been fine until now?

Most of this setup is brand new, but the fueling was all part of the old setup as well. I just recently replaced the engine in this car as I cracked a cylinder wall. From what I remember it would do this with the old engine as well, however it was on stock turbos and an OTS mhd map.

This is the first few days with the new engine and turbos, and I'm working with a tuner to get some logs with a base map. Is ekp failure more progressive? I'm just not experiencing many of the common overheating and shutdown failures that seem to be common with full ekp failure. This is what has me interested in the amperage issue running the pump at higher loads on a stock ekp

[flipmode]

Hmm, I don't think its your ekp. You would get codes or shutdown failures. I was maybe leaning toward a bad tank of gas. Your lpfp and stft's are trying to compensate for the massive drop in Rail pressure and running very lean.

[cway]

Originally Posted by flipmode

Hmm, I don't think its your ekp. You would get codes or shutdown failures. I was maybe leaning toward a bad tank of gas. Your lpfp and stft's are trying to compensate for the massive drop in Rail pressure and running very lean.

I have to get back into the tank as I hung up the fuel float and now I suddenly have more gas in the tank than before.

Is there a chance that a restriction/clog in the fuel pump setup would cause a huge dip in low pressure under load? It seems that under 3500 rpm there isn't an issue regarding low pressure at all.

I assumed that since there is a link between lpfp drop that the HPFP is not necessarily the issue.

Out of ideas to some extent, not sure why low pressure psi would drop at all if there wasn't some sort of restriction under load, being amps to the pump or a physical one.

Thanks for your input so far!