Suggestions for reducing flow through purge valve - Ford Powerstroke Diesel Forum
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post #1 of 9 Old 09-15-2010, 07:06 AM Thread Starter
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Suggestions for reducing flow through purge valve

Howdy guys,

Here's what I have. I run a check valve based conversion with one solenoid valve as a purge valve. The purge valve is hooked up to a timer. The shortest amount that I can set the timer to is about 8 seconds. However, I only need a 3 or 4 second purge (tops) to clear the veg out of my system. In 8 seconds, I push almost a quart of fuel (3/4 of it d2) back to my veg tank. This seems like a waste of diesel.

I have been experimenting with using a ball valve to reduce the flow of fuel, but I was wondering if anyone had other ideas about slowing down the flow of fuel so that in my 8 second purge, I only move about half as much fuel as I am now?

Would it work to put a FPR on the return line? This seems expensive, but would regulate the flow of fuel. Other thoughts?

Thanks!

'96 F-250, 230k
Custom SVO Conversion (check valves)
On board filtration
80k SVO miles and counting!
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post #2 of 9 Old 09-15-2010, 09:02 AM
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i would just bottleneck it somehow. look around on mcmaster site fo rsomething you can slip into the line that has like an 1/8" inside diameter or whatever is appropriate.

-Matt

Late 99 (2/99) Black F250, CC LB 4x4 Lariat 214k. All Stock for the moment...

1995 PSD, ext cab, one wheel wonder , 297k miles, 30k on wvo. totaled 5/8/11 RIP This truck is for sale as a parts truck (Jason is about to receive forged rods, and drop kick his PMR's)
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post #3 of 9 Old 09-16-2010, 05:46 AM
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I use a brass ball valve and turn it until my purge pressure is 10psi - enough to make the engine still run without chugging and leave it there...


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post #4 of 9 Old 09-16-2010, 06:30 AM
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maybe a needle valve? - i think thats what they are called...

-Matt

Late 99 (2/99) Black F250, CC LB 4x4 Lariat 214k. All Stock for the moment...

1995 PSD, ext cab, one wheel wonder , 297k miles, 30k on wvo. totaled 5/8/11 RIP This truck is for sale as a parts truck (Jason is about to receive forged rods, and drop kick his PMR's)
DB high torque starter
DIY 6637
Marinco Mod
DIY Electric fuel w/ wvo conversion

"A clean house is a sign of a mis-lead life."
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post #5 of 9 Old 09-16-2010, 11:04 AM
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I agree with Manky. Just use a manual ball valve. Low maintenance & once it is set your done. That's what I use & works fine.

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 9 Old 09-17-2010, 07:28 AM
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I have a ball valve after the purge valve and have it about half shut. This chokes it enough to keep the fuel psi at about 15 when purging and also is a safety. if my purge valve were to fail on me I would not be able to drive, but since my ball valve is there I can shut it and keep driving. EVERYONE should have a ball valve AFTER the purge valve as a safte. or at least a way to pull the purge line and plug it.

dang it was so clean under there when it was new!


Just a basic 01 F350 CCLB SRW -Good from a far but far from good
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post #7 of 9 Old 09-17-2010, 04:14 PM
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My ball valve has saved me. My purge valve stuck open a while ago. If I didn't have the ball valve there I would have been done.

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 9 Old 09-20-2010, 06:37 PM Thread Starter
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Cool, thanks guys! I threw a ball valve in and am messing around with how open to keep it. At an 8 second purge, wide open throws about 4x as much fuel through it as needs to be purged. At half open, I got a hard start. Fine tuning it now. Let's just hope it stays put once I set it. PSD's arent exactly vibration free...

I appreciate the input.

'96 F-250, 230k
Custom SVO Conversion (check valves)
On board filtration
80k SVO miles and counting!
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post #9 of 9 Old 09-21-2010, 12:38 PM
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35k or so miles now and mine has not moved at all.

Just a basic 01 F350 CCLB SRW -Good from a far but far from good
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