amailloux Posted September 17, 2012 Share Posted September 17, 2012 I have a 2008 6.0 e350 right now with the complaint of low power. Seems a little low on power cruising, but I don't have another to compare it to. no codes. MGP and VGT desired look good. EBP looks good. I was going to drive and monitor fuel pressure, but the fitting is buried behind the harness. Is there any other way to check fuel pressure or is it really that much of a pita to do. I have the intake duct out, and the engine harness won't budge out of the way. Vans are few and far between here. Quote Link to comment Share on other sites More sharing options...
Alex Bruene Posted September 17, 2012 Share Posted September 17, 2012 If you have the 6.0 fuel pressure tester, you can take fuel pressure readings at the rear of the right cylinder head. Quote Link to comment Share on other sites More sharing options...
mchan68 Posted September 17, 2012 Share Posted September 17, 2012 What Alex said, and I vaguely remember during the classroom course in the dark ages, the instructor suggested modifying a spare secondary fuel filter housing cap to accept your fuel pressure gauge for exactly this purpose. Quote Link to comment Share on other sites More sharing options...
amailloux Posted September 17, 2012 Author Share Posted September 17, 2012 I don't have the official version. I removed the plug and went to put a 90 degree fitting on my gauge and the sob snapped. Gonna need a new fitting. Quote Link to comment Share on other sites More sharing options...
amailloux Posted September 20, 2012 Author Share Posted September 20, 2012 Fuel pressure is 48 psi under full load. 55 at idle. mgp is 21-22 psi, vgt is about 68%. ebp is about 48 psi, maf over 300 grams wot 3-4 shift. It looks like this van is putting out all the power it is going to. It's loaded set up to measure during frac operations with pcs, and 5 large pipes in the back. Has the quigly 4x4 package too. If anything looks out of line let me know. Quote Link to comment Share on other sites More sharing options...
Alex Bruene Posted September 20, 2012 Share Posted September 20, 2012 What Alex said, and I vaguely remember during the classroom course in the dark ages, the instructor suggested modifying a spare secondary fuel filter housing cap to accept your fuel pressure gauge for exactly this purpose. I believe that only measures your pre-filter pressure. Knowing the amount of fuel pressure getting to your injectors is more important. Quote Link to comment Share on other sites More sharing options...
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