Compression Ignition Addict
Join Date: Aug 2009
Location: Nova Scotia
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It only does this when purging? The only difference in sound I hear when purging is the engine gets a bit quieter from the loss of fuel pressure.
One thing I did & many others that have DIY's did as well Is install a manual ball valve on the purge line just before the purge valve. This serves 2 purposes. If your purge valve ever sticks open I can shut the manual valve & still drive. If you don't have this & your purge valve sticks open you are dead in the water. The other reason for the manual valve is so you can close it some to restrict the flow so you don't lose all your fuel pressure when you purge. So you may just be dropping your pressure too much when you purge & your injectors don't like it.
You really should have a pressure gauge.
If you want to understand the deadhead system there is a sticky at the top of the page.
2001 f-350 ext.cab. 7.3 auto non dually. 262k miles. New HD tranny at 67,000 miles. Boost, EGT, Tranny temp gauges. 04/10 DIY check valve VO conversion. 20 plate FPHE,Fass HPFP set at 70 PSI,TIH, 10 micron spin on filter with coolant wrap, 150 micron prefilter, hrydraforce purge valve, 40 gallon greasecar tank with hotfox, SS braided hose to heads, Oil temp, pressure & fuel level gauges. 110K miles on grease.
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Monitoring with Torque.