RyanG Posted December 14, 2016 Share Posted December 14, 2016 Have a question about air pressure test for low icp. Truck is from out of town and quit running while driving, icp will only build to around 65 psi sitting in the shop. Verified low pressure oil pressure and no fuel in the oil. Truck just had head studs done and it looks like the cylinder heads may have been replaced (they're painted blue) and a river city egr delete. Swapped a tester ipr and still no start. I have the oil filter out with air going in to the oil rail and I can hear oil bubbling inside the filter housing. I don't hear any leaks other than faint hissing in the crankcase and I was getting ready to look at the stc fitting. Is the bubbling normal to hear or is there air pushing back through the high pressure oil pump? Quote Link to comment Share on other sites More sharing options...
lmorris Posted December 14, 2016 Share Posted December 14, 2016 Not normal.On the early style pumps, they do this when the HPOP goes bad. Don't quote me, but I believe the new style pump will do this as well if it fails. It's basically allowing the air to flow backwards through the pump, which means it's toast. STC fitting failures usually will give you at least 200 PSI. Quote Link to comment Share on other sites More sharing options...
batmantech Posted December 14, 2016 Share Posted December 14, 2016 For a little more info on the gurgling click >>>>> "2005 e450 no start warm" Quote Link to comment Share on other sites More sharing options...
mchan68 Posted December 15, 2016 Share Posted December 15, 2016 I just buttoned one up today that failed so bad it cracked the rear cover. If I recall correctly, it only got as high as 65psi cranking. Quote Link to comment Share on other sites More sharing options...
forddieseldoctor Posted December 15, 2016 Share Posted December 15, 2016 Not normal. Not exactly true. The air leak will echo through the block and come up through the drain valve and sound like it's a junk pump. I've seen it on a couple of trucks now. If you push the drain valve down it goes away. Quote Link to comment Share on other sites More sharing options...
batmantech Posted December 15, 2016 Share Posted December 15, 2016 The ones I have done, the air noise through the oil filter housing is a gurgling noise not air noise. Quote Link to comment Share on other sites More sharing options...
forddieseldoctor Posted December 15, 2016 Share Posted December 15, 2016 The ones I have done, the air noise through the oil filter housing is a gurgling noise not air noise. I forgot about that but yeah that too. Quote Link to comment Share on other sites More sharing options...
RyanG Posted December 16, 2016 Author Share Posted December 16, 2016 I got down to the pump and air pressure tested at the stc fitting with adapter I made from an old fitting and had no leaks. I pulled the pump out and put air through the stc fitting and had a bunch of air blowing out of the pump oil inlet, block off the inlet and fitting was holding. Had to put it back together, the guy is towing back to his mechanic who said that's not the problem. Moving on. Another indicator I forgot to mention is when I was air testing it at the oil rail I took the turbo oil supply tube off and oil starting spitting everywhere. Quote Link to comment Share on other sites More sharing options...
Matt Saunoras Posted December 16, 2016 Share Posted December 16, 2016 I bench air checked a pump before and it only had a small leak out of the IPR dump port. The inlet had no leak. Quote Link to comment Share on other sites More sharing options...
forddieseldoctor Posted December 17, 2016 Share Posted December 17, 2016 Another indicator I forgot to mention is when I was air testing it at the oil rail I took the turbo oil supply tube off and oil starting spitting everywhere. With that additional piece of info I agree the pump is toast. Quote Link to comment Share on other sites More sharing options...
BrunoWilimek Posted January 3, 2017 Share Posted January 3, 2017 I was told that if you took out the filter, depressed the valve at the bottom and air tested it and it gurgled out the filter housing that the pump was bad, so agree with that being likely cause.There was another way to test the pump by graphing pressure output that would show an irregular pattern that would mean the pump was bad, but don't remember the pids to view now. Quote Link to comment Share on other sites More sharing options...
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