Running out of fuel pump or injector issue?
Thread Starter
TECH Resident
iTrader: (1)
Joined: Dec 2001
Posts: 933
Likes: 0
From: Overland Park, KS, USA
Running out of fuel pump or injector issue? I am trying to figure out why I am maxxing out my SVO 30# injectors. With my setup I should be fine based on sizing calculated using 450 rwhp (~575 bhp), but my injector duty is running above 80% starting at 5300 rpm. I was fine before the upgrade and have added about 50 rwhp. Question: If the pump is failing can that increase the injector duty? You would think if the pump is the issue then the injectors would be supplying less fuel. Also, I guess if the pressure at the rail is less than it should be that would throw off the IFR table data. Any experience here would be much appreciated. Thanks.
Thread Starter
TECH Resident
iTrader: (1)
Joined: Dec 2001
Posts: 933
Likes: 0
From: Overland Park, KS, USA
Do not have a fuel pressure gauge...... instead of spending money on the injectors I should probably get one first. If the pressure is low, why would the injector duty go up though? The IFR data would be lower than the pcm thinks it is.... would that cause this problem?
Get a gauge that you can read in the car under full throttle. This way you can establish that the pump is up to the demands. Then you can look into other details. Otherwise you modify the tune to cover up other fuel issues.
Thread Starter
TECH Resident
iTrader: (1)
Joined: Dec 2001
Posts: 933
Likes: 0
From: Overland Park, KS, USA
That is what I have come to also. I did tap into the fuel pump ignition wire under the fuse block for my EWP. Could this cause a voltage problem with the pump?
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Thread Starter
TECH Resident
iTrader: (1)
Joined: Dec 2001
Posts: 933
Likes: 0
From: Overland Park, KS, USA
Weird thing though.... on my previoust engine I had a 100 shot of nitrous and had it tuned on a dyno at safe AFR and the injector duty was less than 80% on the gas. Probably my pump went out and did not realize it and that is why I lifted a ringland and cracked a cylinder wall. This car is not going anywhere until I get a pressure gauge and go from there..... btw, anybody need a complete nitrous setup? Cheap.
