Fuel pressure drop when purging on dead head system - Ford Powerstroke Diesel Forum

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post #1 of 21 Old 07-13-2013, 09:22 AM Thread Starter
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Fuel pressure drop when purging on dead head system

Hi there.
A while back I posted a thread on an audible change in idle on purging my new dead head system. I finally got around to installing some gauges and have noticed that when purging, my fuel pressure drops to 0 on gauge. That would explain the sound of my idle changing as fuel starvation. Is this a normal drop while purging? Could I avoid the degree of fuel starvation by waiting a bit after switching to purge? Thanks in advance for thoughts, matt
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post #2 of 21 Old 07-13-2013, 09:47 AM
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Zero psi is obviously not good. Most of the people running a Vegistroke see ~ 25 psi while purging.

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post #3 of 21 Old 07-13-2013, 10:37 AM
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there's no "restriction" when purging, so 0psi is what you should see. I see the same number when purging. I kill the wvo pump and flip the d2 pump on, and "wash" the cylinders and injectors for a good 5 miles. Then once home/whever im at, and ready to turn off truck, i keep key to "acc" and flip purge on and "flush" the wvo lines for about 10-15 sec.

Ya, you dont want to run the truck with 0 psi.

99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #4 of 21 Old 07-13-2013, 10:59 AM
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install a ball valve between the purge valve and the tank to restrict flow, creating back pressure thus increasing your fuel pressure above safe and acceptable levels.

99 F350 7.3
320K w/ 150k+ on Biofuels

Casserly Stage 2's-TE Modded 17 HPOP
DP Tuner F6 & PMT1-Van Turbo Non EBPV & 6637
Twin Fass Pumps B100 & D2 Regulated Return- Fuel Lab
Isspro Pyro, Trans, Boost-Air and Fuel Temp
WVO processed by Simple Centrifuge
B100 by Biopro 190
B100 powered Excursion, F250 CCSB, and Two TDI Jettas
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post #5 of 21 Old 07-14-2013, 11:03 AM
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Quote:
Originally Posted by vegginpsd View Post
install a ball valve between the purge valve and the tank to restrict flow, creating back pressure thus increasing your fuel pressure above safe and acceptable levels.
Yep that's all you need to do. I have mine set to approx. 20 psi. If your purge valve ever sticks open( mine did that once) you can close the ball valve & still drive. Without it a stuck purge valve will leave you dead in the water.

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. Monitoring with Torque.
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post #6 of 21 Old 07-14-2013, 12:39 PM Thread Starter
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Thanks guys! I'll get around to installing a ball valve soon. In the meantime I'll use Timmy boys method which sounds pretty perfect too.
Do you think I've have harmed my precious injectors by purging while running? It seems like there would be enough fuel in he rails to keep them lube'd and fed no? Aside from the time my wife held purge switch down for a minute while still on veg!? Thanks again!
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post #7 of 21 Old 07-15-2013, 03:04 AM
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Timmyboys method is not as effective.

No I don't think you have damaged your injectors.

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. Monitoring with Torque.
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post #8 of 21 Old 07-15-2013, 11:06 AM Thread Starter
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Thanks Simone, do you have a preferred ball valve for Wvo? I should look at one that's stainless of alum yes?
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post #9 of 21 Old 07-15-2013, 12:24 PM
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here is where I generally buy valves

Stainless Steel Ball Valves

99 F350 7.3
320K w/ 150k+ on Biofuels

Casserly Stage 2's-TE Modded 17 HPOP
DP Tuner F6 & PMT1-Van Turbo Non EBPV & 6637
Twin Fass Pumps B100 & D2 Regulated Return- Fuel Lab
Isspro Pyro, Trans, Boost-Air and Fuel Temp
WVO processed by Simple Centrifuge
B100 by Biopro 190
B100 powered Excursion, F250 CCSB, and Two TDI Jettas
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post #10 of 21 Old 07-15-2013, 07:22 PM Thread Starter
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Thanks for the link and the valuable info! Ill buy a ball valve tomorrow. Is it generally a good idea to keep valve ports same diameter as hose? Lastly, (for now) I have some left over push lock jic (female to barb) fittings from install. Would it just take male jic to male npt adaptor to plumb into ball valve? Thanks again!
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