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Has anyone here ever outrun a LP piston lift pump?

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Old Apr 27, 2011 | 05:50 PM
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From: Wyo
Has anyone here ever outrun a LP piston lift pump?
What I mean is, have you pulled your fuel pressure down low when running a low pressure lift pump?

I was curious to know if it's happened to anybody. What were the details of your setup when this happened?
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Old Apr 27, 2011 | 08:58 PM
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My 93 will pull down to 2 or 3 pounds through stock lines and filter. Thats at 300 horses with my 16's.
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Old Apr 28, 2011 | 09:26 PM
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I saw a '93 suck a LP pump down to zero PSI...WITH a big fuel line setup.

He had a maxed out VE and 6x16's.
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Old Apr 29, 2011 | 12:54 AM
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Stock filter and lines, 6X16's, sucks the piston pump down to ZERO.
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Old Apr 30, 2011 | 01:38 AM
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I have never gotten the gauge on mine but I certainly have gotten them to leak into the crankcase thats for sure...
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Old Apr 30, 2011 | 11:26 AM
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I'm running 80hp injectors, a modified Bully Dog fuel pin and with a new filter and IP turned to the stop I can drop it to five pounds.
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Old Apr 30, 2011 | 11:32 AM
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So us regular folks, who may wear tennis shoes or an occasional python boot wouldn't have any concern?
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Old Apr 30, 2011 | 02:07 PM
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I think I may be pulling my pressure down... seems to run out of juice up on top. However, I still need to advance the timing, and install a fuel pressure gauge.
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Old Apr 30, 2011 | 02:11 PM
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Originally Posted by cougar
So us regular folks, who may wear tennis shoes or an occasional python boot wouldn't have any concern?

Correct.

Digging through past threads, I found that my experience was . . . .

With the regular piston lift-pump, 3/8"ID plumbing and a big fuel filter, running PDR "190" injectors with the typically tweaked injection pump, I'm seeing . ..

- Approximately 12psig while free-revving the engine to 2500rpm.
- Approximately 9psig at idle.
- Approximately 7psig under WOT.
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Old Apr 30, 2011 | 02:22 PM
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Well shoot, PDR 190's are pretty small aren't they? I running injectors that are 241% larger than stock in respect to orifice size.
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Old Apr 30, 2011 | 03:10 PM
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Originally Posted by The_Head
Well shoot, PDR 190's are pretty small aren't they? I running injectors that are 241% larger than stock in respect to orifice size.
I agree, you'd see lower pressures. It's just for comparison.
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Old Apr 30, 2011 | 04:12 PM
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Originally Posted by The_Head
I think I may be pulling my pressure down... seems to run out of juice up on top. However, I still need to advance the timing, and install a fuel pressure gauge.
That is what mine is doing with the diaphragm pump now. With all you got going on you probably are. Time to dig back through the threads and look at the high volume converted to low pressure pump or go electric.
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Old Apr 30, 2011 | 06:39 PM
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From: Wyo
oh yeah, I had forgotten about the high volume low pressure lift pump. I'll have to contact Jbradley500. I think he put one of those in.
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Old Apr 30, 2011 | 07:37 PM
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With a 2nd gen piston lift-pump and regulator, 3/8"ID plumbing, etc, DDP4s could pull it down to 8psig @ WOT.
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Old Apr 30, 2011 | 07:42 PM
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From: Wyo
What are you running now? I was thinking about an Airdog 100 or 150 for a 24 valve application. I think I remember reading they are regulated to the same pressure as what out injection pump needs.
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