Nissan 370Z Forum - View Single Post - Fuel issues after installing new aftermarket upgraded fuel pump assembly

Sisk370gt · 04-21-2022, 12:54 AM

Hey guys this is my first post here but I’m having a weird issue. Here’s what’s going on with the car. I bought a modified aftermarket fuel pump assembly with a DW340 inside and I installed it now my car goes extremely lean (17+afr) at 3k rpm. I went a parked the car right after and sent the log to my tuner. They told me to check fuel pressure but don’t have a gauge. The car ran good with the stock pump and 660 injectors on the base map.
I’m thinking it’s losing fuel pressure while going up in the revs. Has anyone one else have issues like this when installing a aftermarket pump?

I went threw the forums and couldn’t find anyone with this exact issue

04-21-2022, 12:54 AM	#1 (permalink)
Sisk370gt Base Member Join Date: Mar 2012 Location: fort lewis Posts: 2 Drives: G37s Rep Power: 13	Fuel issues after installing new aftermarket upgraded fuel pump assembly Hey guys this is my first post here but I’m having a weird issue. Here’s what’s going on with the car. I bought a modified aftermarket fuel pump assembly with a DW340 inside and I installed it now my car goes extremely lean (17+afr) at 3k rpm. I went a parked the car right after and sent the log to my tuner. They told me to check fuel pressure but don’t have a gauge. The car ran good with the stock pump and 660 injectors on the base map. I’m thinking it’s losing fuel pressure while going up in the revs. Has anyone one else have issues like this when installing a aftermarket pump? I went threw the forums and couldn’t find anyone with this exact issue