Duramax Diesels Forum Truck of the Week
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Old 09-13-2018, 01:49 PM
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Default 6an feed line too small?

Not sure where to put this but itís for a drag truck. Iím trying to clean everything up I want to make the feed lines for the cp3s an line. I got 8an going in to 2 6an lines for the feed lines. Looking inside the 6an fittings they look pretty small will they work or no? Thanks in advance
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Old 09-13-2018, 06:41 PM
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Being a drag truck, no. A -6 line would be the same ID as a stock fuel line feeding the cp3. A -8 matches the inlet size of the cp3 case pretty well, assuming you've got different inlet fittings installed already.
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Old 09-13-2018, 06:52 PM
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I suggest doing 1/2 fittings and 8an hoses. You need volume. Otherwise you have to make up for it with pressure. Witch most stroker cp3s dont like.
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Old 09-13-2018, 07:22 PM
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Is this a stock CP3 or ported?
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Old 09-13-2018, 08:50 PM
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I wouldn't even bother with anything less than -8 for feed side. I have 1/2 hose with -8 fittings running from sump through airdog straight to cp3 and all 3/8 hose with -6 fittings on the entire return side.
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Old 09-13-2018, 11:15 PM
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If its a stock pump, isn't the input fitting something like 1/8" inside?
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Old 09-14-2018, 03:14 AM
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Default 6an feed line too small?

Just keep in mind the smallest orfice no matter where it is in that line is your highest restriction. You could put 3Ē line on but that restriction will only allow so much flow through at X pressure. Hence the reason some people port the orfice in the fuel rails or the fpr.

The only thing larger hose does for you is reduce friction and slow the speed of the fluid while raising the volume up to that point. Especially if itís going around bends.

Running larger fuel hose will benefit you if you have increased the inlet size at the pump or are splitting the flow to two or three pumps. Running -8 or -10/-12 would benefit you in this instance.

Last edited by LBZ; 09-14-2018 at 03:21 AM.
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Old 09-14-2018, 06:32 AM
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Quote:
Originally Posted by 2004LB7 View Post
If its a stock pump, isn't the input fitting something like 1/8" inside?
5/16". The port in the case itself is 3/8" IIRC, so going bigger than that is pointless. BUT I did put a 1/2" fitting on mine (which steps down at the threads) just because I wanted to run one solid hose from the filter.
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Old 09-14-2018, 06:53 AM
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Exergy stroker pumps come with stock barbs installed. If they required a bigger fuel line, I would think they would supply a larger fitting. A 1/2" hose may make you feel all warm and fuzzy inside, but I don't believe it really does anything for performance. You are splitting a single 1/2" line into 2 3/8" lines; I don't see how you will gain anything by splitting one 1/2" line into 2 1/2" lines.
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Old 09-14-2018, 08:18 AM
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I replaced the stock cp3 inlet fitting with a -8an fitting, weather it helps or not wasn't my concern just assembling everything was easier knowing it was all the same size
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Old 09-14-2018, 08:18 AM
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I think youíll be fine, Iím running a -8 all the way up and dropping down to a -6(12mm pump)cause space is limited. Just make sure you have a good volume fuel pump.
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Old 09-14-2018, 08:54 AM
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As mentioned above, the gear pump on the back has a 0.108" opening for fuel. That is less then 1/8"

Also the feed fitting for the pump is also quite small, maybe smaller, as shown in this photo. Stock on left, ported on right
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Old 09-14-2018, 11:39 AM
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They are both stock pumps and as of right now have the stock 5/16 fittings on The back of them
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Old 09-14-2018, 12:11 PM
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Quote:
Originally Posted by JoshH View Post
Exergy stroker pumps come with stock barbs installed. If they required a bigger fuel line, I would think they would supply a larger fitting. A 1/2" hose may make you feel all warm and fuzzy inside, but I don't believe it really does anything for performance. You are splitting a single 1/2" line into 2 3/8" lines; I don't see how you will gain anything by splitting one 1/2" line into 2 1/2" lines.
Going from 5/8 and splitting into (2) 1/2 " lines helped by 3psi wot. Before was 1/2 split into (2) 3/8.
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Old 09-14-2018, 02:42 PM
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Quote:
Originally Posted by Ne-max View Post
Going from 5/8 and splitting into (2) 1/2 " lines helped by 3psi wot. Before was 1/2 split into (2) 3/8.


3psi on the lift pump?
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