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drilling connector tubes

19367 Views 85 Replies 19 Participants Last post by  dodgeram2500
Getting ready to drill my connector tubes on a VP truck, does anyone know what size to drill bit??? Any do's and don't to watch out for???
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· Cummins CrAzY
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Well I'm about to do the same thing. .093 is a 3/32 you need a long drill bit I found mine @ fastenal I also got 1/16 and 5/64 to go in steps since I didnt know what the OE size is.
 

· Cummins CrAzY
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Oh ya, I got a used stock set so if I mess up my truck isnt down.
 

· Mark Ward
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just make sure you get it extremly straight.
 

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Discussion Starter · #5 ·
Ya, I plan on riggin up a jig of some sort and using the drill press. Any ideas what size the oversized lines are??? Who sells oversized tubes?
 

· Mark Ward
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Haisley Machine and Home Mike at monster pump sells billet tubes. Haisley has lines and tubes. my lines are .093
 

· Cummins CrAzY
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Well I got my connector tubes today and got the edge filters drilled out. I took a 5/32 bit and drilled in a little ways then took a 3/32 bit and went in a little further. Some of the edge filters came out w/ the bit but if it doesn't you can take a 1/16 dowel and tap it out from the opposite end. I couldn't get it to tap out with out drilling it first. I am a little intimidated to drill out the connector tube, going to see how much the machine shop will charge to do it.
 

· Cummins CrAzY
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More fuel flow. If you have ever looked down a stock connector tube you would understand. I dont even see how fuel got through there!
 

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Not worth the risk if you don't have an extra set. I used a #40 drill bit which is a .098. The first one I drilled got seized up and broke off. If you do drill them out be sure to use alot of wd40. I drilled about an 1/8 in backed out sprayed wd40 and so on. There was no lope no difference in power IMO waste of time.:thumbsup
 

· Premium Member
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Well the thing with doing this is that you are opening up line sizes. especially if you get oversized lines. these pumps are calibrated with a certain line size and length. the pump is set up to pump a certain amount of fuel. opening up the hole size can actually hurt driveability without extra fueling.
 

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Now this is really, something drilling out the hole on a threw connector and figuring you will get more flow. you are talking about thousands of pounds of fuel pressure and you are worried about restriction, I would be more worried about after drilling that it will crack. Mercedes used the same set-up on a 906 and they can and do crack them. PLEASE DYNO before and after, I can't see how there is any benefit. PLAY SAFE
 

· Tech Specialist
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More fuel flow. If you have ever looked down a stock connector tube you would understand. I dont even see how fuel got through there!
Looked down them more times than I can count. Your not gonna gain any flow and your more than likely gonna cause a lopey idle and possibly hurt driveability and maybe power as well. Same goes with larger lines. They don't help power on these VP trucks. All they do is cause lopey idles and poor driveability.
 

· Mark Ward
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mike recomends billet tubes or drilled tubes to .093 when you install his pumps.
 

· Cummins CrAzY
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To each his own. I will do it if it dont work, I will go back to stock.
 

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wont opening up the connector tubes decrease the overall pressure from injector to pump ? you are increasing the total volume therefore decreasing the total pressure for a given amount of fuel the pump can pump in a given period of time. right or wrong ?
 

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Now this is really, something drilling out the hole on a threw connector and figuring you will get more flow. you are talking about thousands of pounds of fuel pressure and you are worried about restriction, I would be more worried about after drilling that it will crack. Mercedes used the same set-up on a 906 and they can and do crack them. PLEASE DYNO before and after, I can't see how there is any benefit. PLAY SAFE
that would be like saying having injectors with bigger holes in the nozzle wont do anything. a restriction is a restriction, it means less fuel.

now the question is, can the pump supply the volume
 

· Cummins CrAzY
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If it didnt have any affect then there wouldnt be a market for them and people wouldnt sell them. I think rollin coal hit it on the head though, can the pump supply the volume. We will see, got the connector tubes drilled today and as soon as the lines get here I will get it all put on and report the findings.
 
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