CTConsruction Posted March 22, 2016 Share Posted March 22, 2016 Guys, I'm new to the site and in need of some help. Have a 2002 CH613 with the 427 engine. I believe it is the Etech, someone correct me if I'm wrong. Love the truck but power seems to be intermittent almost to the point to where it doesn't seem to be fueling. Normally I can lift off the pedal and back on and the power will come back. I was told it could be an 'fuel saver' program in the ecm due to the fact it was a fleet truck. Local mack dealer says there are no codes related to low power, cost me $300 to find that out. I'm fairly mechanically inclined, have lots of experience on 5.9 cummins. Heard the plastic fuel pump gears give issues. Pretty much attribute this to a fuel problem being that it isnt a constant problem. Any advice greatly appreciated Quote Link to comment Share on other sites More sharing options...
fjh Posted March 23, 2016 Share Posted March 23, 2016 So You need to install a fuel pressure Gauge to find out OR replace the transfer pump! There is a fuel gallery plug on the front of the block just above the crank case canister lid you need to remove the lid to get to it! Fuel pressure can be between 60 - 100 no lower than 60 2 Quote Link to comment Share on other sites More sharing options...
TRH Posted March 23, 2016 Share Posted March 23, 2016 Tee a gauge into the outlet of the pump. 85-100psi is spec, no less . There's a 1/8npt port in the intake manifold to check boost as well. Start with the basics. Sent from my iPhone using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
CTConsruction Posted March 24, 2016 Author Share Posted March 24, 2016 Kinda where I figured, fuel and air. Will check! Thanks Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted March 24, 2016 Share Posted March 24, 2016 If you use the fuel galley like been stated it will tell you if your filter is good also.I like doing the test under load for a few miles. Quote glenn akers Link to comment Share on other sites More sharing options...
CTConsruction Posted March 24, 2016 Author Share Posted March 24, 2016 I replaced filters yesterday, no change. Truck was checked out by local dealer and said nothing seemed wrong. But there is definitely something off with it, certain times it just feels dead at takeoff. Even when it feels like it's fueling at the full rate, the truck seems a bit weak to me. Boost gauge will be easy to hook up. I noticed several 1/8" plugs along the side of the block. I was thinking of just t-ing into the fuel line for a pressure gauge. I've also read on here about ecm updates that effect throttle response.....I assume buy fueling at lower boost levels. Ive only grossed 60,000 or less. Can't imagine what it would feel like at 80,000 or more. Quote Link to comment Share on other sites More sharing options...
CTConsruction Posted March 24, 2016 Author Share Posted March 24, 2016 From what I've seen boost should he 25-30 psi Quote Link to comment Share on other sites More sharing options...
bts-4120 Posted March 25, 2016 Share Posted March 25, 2016 my 01 427 will make 30-32 on a hard pull if you got fuel psi and boost it may be the foot throttle had to replace mine 1 Quote Link to comment Share on other sites More sharing options...
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