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Fuel inlet mods?

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Fuel inlet mods?

Postby Remps » Wed Jan 13, 2010 3:17 pm

How does one reliably feed 30 to 70 psi into the fuel inlet? I have heard red loctite works on the stock fitting. What else besides the front seal is negatively affected by high pressure? Is the front seal on/in the fuel inlet fitting? What kind of fitting would you retap the hole for if necessary?
'90 D250 R/C,727,IC,6x.009's,1/8" bump,fuel psi,straight pipe w/5" stack.
'90 W250 R/C,47rh,K@N,HX35,1/8" bump,2nd gen IC,boost,egt,trans temp.3.07's.
'96 2500 S/C L/B,2wd,NV5600,3.54 L/S,cai,egt,pacbrake,mbrp exhaust,10 plate.
Bring back the Bank of Canada, PRE- 1974.
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Postby doublel89 » Wed Jan 13, 2010 3:50 pm

I think it's the front seal of the injection pump it'sself.
91 3/4 Ton 4x4, 5.9 Cummins,DDP Fuel Pin I usually leave it out though, DDP 40 Horse Sticks, HX35W And 2nd Gen Intercooler, Single 5'' Trunout, NV5600 Swap, Dually Conversion, 3.08 Rear Gears, Soon A Custom Hauler Bed
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Postby PRINCETON_JAKE » Wed Jan 13, 2010 4:30 pm

yes, the front seal will blow out of the injection pump, filling the cranck case with fuel. i dont think there is any benefit of high fuel pressure anyways.
1992 cummins, 2wd, A518, WH1c, 60mm,12cm housing, fuel screws maxxed, fuel pin turned and ground, 3200rpm spring, big Amsoil air filter, 4" stack, timming bumped, piston lift pump, Bosch 190's, 18" Maxxi Hulk rims, and Nitto Terra Grapplers.
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Postby Remps » Wed Jan 13, 2010 6:16 pm

KTA, how the heck does your front seal stay together? :) I am thinkin that with the 250 cc pump I had built, higher inlet pressures could help with any case pressure issues.Also thinkin 6x14 injectors.Also thinkin A1000 with boost referenced reg.I would rather just upgrade once.
'90 D250 R/C,727,IC,6x.009's,1/8" bump,fuel psi,straight pipe w/5" stack.
'90 W250 R/C,47rh,K@N,HX35,1/8" bump,2nd gen IC,boost,egt,trans temp.3.07's.
'96 2500 S/C L/B,2wd,NV5600,3.54 L/S,cai,egt,pacbrake,mbrp exhaust,10 plate.
Bring back the Bank of Canada, PRE- 1974.
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Postby fergavs » Wed Jan 13, 2010 6:35 pm

The front seal is on the pump shaft that the drive gear resides on. The best fix for the front seal is red loctite and you machine a grove around the boss for the seal. In this grove you install a snap ring. I don't have any loctite on mine but I do have the snap ring and it has never failed me. With both of those done 40-50 psi should b safe. The fuel inlet on my pump was also enlarged to allow a larger volume of fuel into the pump. AN fittings are typically used but pipe fittings would b fine as well.
1990 Dodge D350 Duallie 2wd, Piers ported, ringed,HD springed,ARP studed head,S300,PS IC,Custom EDM's,Max Spool 2 Cam,BD built 47RH auto,Meth,5" Exaust, AD 150, Punched VE Mod,2 Stage Nos,etc.
92 4x4 47RH,06 Turbo,6" with 40's on 20's,6" Stack
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Postby RSWORDS » Wed Jan 13, 2010 6:42 pm

Does anyone have any pictures of the seal fix?
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Postby PRINCETON_JAKE » Wed Jan 13, 2010 6:51 pm

how do you enlarger the fuel inlet? any pictures?
1992 cummins, 2wd, A518, WH1c, 60mm,12cm housing, fuel screws maxxed, fuel pin turned and ground, 3200rpm spring, big Amsoil air filter, 4" stack, timming bumped, piston lift pump, Bosch 190's, 18" Maxxi Hulk rims, and Nitto Terra Grapplers.
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Postby oldestof11 » Wed Jan 13, 2010 7:11 pm

PRINCETON_JAKE wrote:how do you enlarger the fuel inlet? any pictures?


Machine shop could do it for you.
Jon
93 D250~ Mismatch of cheap parts, trying to look fast going slow
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Postby KTA » Wed Jan 13, 2010 7:38 pm

The stock inlet with high pressures has been fine for me using a -6 jic sized fitting and line. My seal is held in with a retainer and 3 countersunk bolts. Realize this was done to this pump about 15 years ago and a lot has changed sinc then. If I was to do another one I would use the red loctite with a cleaned seal so it was metal to metal. If you apply the loctite to the outer painted part of the seal the paint is weak and it can still blow out. I think the loctite would hold, and it has on several pumps I have built, but they don't thrash theirs as hard as mine anyways so who knows.
Fleet of Junk: 1989 D350 627rwhp 1300 tq B-1/Hx60 twins, KTA pump/injectors, ported head, BIG fuel supply. 13.75@ 109.5mph 1/4: 1992 W350 Cab-chasis, 1993 W350 ext cab cust.370 inj Hx40/16cm 290rwhp hydroboost brakes,1984 D350 crew-cab another project.
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Postby PRINCETON_JAKE » Wed Jan 13, 2010 8:05 pm

oldestof11 wrote:
PRINCETON_JAKE wrote:how do you enlarger the fuel inlet? any pictures?


Machine shop could do it for you.


I work at a machine shop, i want to know what to do to it?
1992 cummins, 2wd, A518, WH1c, 60mm,12cm housing, fuel screws maxxed, fuel pin turned and ground, 3200rpm spring, big Amsoil air filter, 4" stack, timming bumped, piston lift pump, Bosch 190's, 18" Maxxi Hulk rims, and Nitto Terra Grapplers.
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Postby oldestof11 » Wed Jan 13, 2010 8:39 pm

If you take the pump apart, it necks down and does a sharp 90* kinda like a L. At the bottom of the L, the fuel goes into the vane pump.
Jon
93 D250~ Mismatch of cheap parts, trying to look fast going slow
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Postby fergavs » Thu Jan 14, 2010 11:49 am

I'll try to post a pic of my inlet fitting and my seal retainer in the next day or two.
1990 Dodge D350 Duallie 2wd, Piers ported, ringed,HD springed,ARP studed head,S300,PS IC,Custom EDM's,Max Spool 2 Cam,BD built 47RH auto,Meth,5" Exaust, AD 150, Punched VE Mod,2 Stage Nos,etc.
92 4x4 47RH,06 Turbo,6" with 40's on 20's,6" Stack
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Postby RSWORDS » Fri Jan 15, 2010 7:10 pm

Please do... I have teh front of teh truck off and want to do it before I put it together.
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