Fuel questions.

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myusername

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Apr 5, 2011
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I have been searching around for a few weeks now since i've installed my new turbo, a super b special, about delivery valves and such. My 160 pump has been benched, and flows 375cc's of fuel with no plate, according to DPE, on stock delivery valves. In my research, I have seen a few references to "1.6hp per cc of fuel". I know thats gotta be a rough estimate, but thats roughly 600hp worth of fuel. But my special, stock wastegated at 43psi, is clearing up my pump with no plate and basic afc tuning. There is not even a slight haze at full boost. I dont know what a true high horsepower truck feels like, but a buddy of mine, who has been around a lot of trucks, was in my truck and doesnt think its over 400hp. I personally would be very surprised if i'm even close to 400hp. By the way, I have a fass 150 feeding my injection pump at about 65psi. I know thats a little high, but the guys at fass, and the owner at DPE both said that my pump would be happier at those higher psi levels.

I'm learning as I go on this build, and have been doing a ton of research about delivery valves. I just feel like my current pump setup should be enough for my goal of "around" 500hp. I just want a respectable strong running truck. I am running DAP 5x.015 VCO injectors, which I installed with the turbo.

I dont want this truck to smoke, But I feel like since the pump is maxed, and there is not even a haze, I dont have enough fuel for the turbo? Should I upgrade DV's? or do you guys think i have another problem?

I know you guys have alot more experience than I do.
 
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I am thinking I will be going with a set of .024's or SDX comp's here soon. I am just hoping something will wake this thing up. I feel like 500hp or more wouldnt be out of the question with this turbo/injectors. I just need to figure out how to get there
 
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I've been having the same problem as you with the same set up. What stall of converter do you have? I just sent my pump off to get benched so we will see what happens when I throw more fuel at it
 
It's a 1800 stall convertor. I've been reading about the afc spring binding, so I may order the tst kit. Its only like $35 so well see where that gets me before I change dv's. I also need to change the timing from 16* up to around 20 and see what that changes
 
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I have my 191s out of my truck if you want to stop by and grab them to see how it does. Just let me know
 
Sounds like you could really benefit from a longer than stock afc spring.

You should have well over 400hp if the afc is set up properly.
 
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myusername said:
I am thinking I will be going with a set of .024's or SDX comp's here soon. I am just hoping something will wake this thing up. I feel like 500hp or more wouldnt be out of the question with this turbo/injectors. I just need to figure out how to get there
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The 024s (DDP 042) will wake it up. The Comps are a step above. Make sure you install a FP gauge too.
 
mathews8pt said:
I have my 191s out of my truck if you want to stop by and grab them to see how it does. Just let me know
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I'm heading up to marion saturday anyways, so I'll get ahold of you and see where your at. The 191's arent really the direction I want to go, but it will help me figure out if my problem lays in the delivery valves I guess.

I had a fuel pressure gauge installed, a 60psi isspro gauge, and it stayed pegged the whole time. the gauge on the fass was reading close to 70. The gauge is not hooked up, since i need to send it back and have it recalibrated to a 100psi gauge.

I will order the tst spring kit today or tomorrow.

Like I said, i'm learning as I go with this thing, and the situation i'm in, I need to get it running the way it should pretty quickly so I can focus more on buying the house.
 
myusername said:
I'm heading up to marion saturday anyways, so I'll get ahold of you and see where your at. The 191's arent really the direction I want to go, but it will help me figure out if my problem lays in the delivery valves I guess.

I had a fuel pressure gauge installed, a 60psi isspro gauge, and it stayed pegged the whole time. the gauge on the fass was reading close to 70. The gauge is not hooked up, since i need to send it back and have it recalibrated to a 100psi gauge.

I will order the tst spring kit today or tomorrow.

Like I said, i'm learning as I go with this thing, and the situation i'm in, I need to get it running the way it should pretty quickly so I can focus more on buying the house.
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If your gauge is reading 60+ psi and you're running out of fuel with your set-up I would suspect there is a major bottleneck in your supply lines somewhere. It could be as simple as a fitting somewhere. Take a look at the ID of the fitting on your pump inlet...that is a recurring place we have seen problems.
 
CTDYoungGun said:
If your gauge is reading 60+ psi and you're running out of fuel with your set-up I would suspect there is a major bottleneck in your supply lines somewhere. It could be as simple as a fitting somewhere. Take a look at the ID of the fitting on your pump inlet...that is a recurring place we have seen problems.
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it is 3/8" soft line all the way from the fass to the IP with quick connect fittings from FASS on each end, with a T-fitting for the fuel pressure gauge in the line. I plan on putting a sump in my tank here within a couple weeks hopefully, and would like to upgrade everything to 1/2", and install the pressure sender in the fass itsself, to remove the T-fitting junk. Do you think that would help? I was kind of hoping you would chime in, since I know that you obviously know about these pumps.
 
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myusername said:
it is 3/8" soft line all the way from the fass to the IP with quick connect fittings from FASS on each end, with a T-fitting for the fuel pressure gauge in the line. I plan on putting a sump in my tank here within a couple weeks hopefully, and would like to upgrade everything to 1/2", and install the pressure sender in the fass itsself, to remove the T-fitting junk. Do you think that would help? I was kind of hoping you would chime in, since I know that you obviously know about these pumps.
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That sounds like a good plan...another thing to consider is removing the heli-coil from the pump inlet (making it m16x1.5 thread) and then drilling whatever fitting you get to the same ID all the way through. IIRC, some of those metric to AN fittings neck down to under .250" ID...which would create a false/high pressure reading in the line and show a lack of fuel pressure/volume in the pump. Just some food for thought...
 
Okay, I will make sure I look into those things. I was wondering if at my power level, it would make any difference. But i'm sure it would probably help out at any level.

I just ordered the TST spring kit, so we'll see how that helps while I justify spending the coin on all the other parts I should upgrade, even though I know it needs it
 
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