THD fuel pin

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THD fuel pin

Postby 92cummins89 » Mon Nov 27, 2017 8:25 pm

Installed a THD fuel supposed to get 40 more hp but to be honest doesn’t feel like it did anything
1992 4x4, 4” diamond eye exhaust, nv4500, he351cw
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Re: THD fuel pin

Postby fatty » Mon Nov 27, 2017 9:18 pm

What pin did you replace? Have you checked to make sure the slide pin inside the pump is functioning?
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Re: THD fuel pin

Postby 92cummins89 » Mon Nov 27, 2017 10:42 pm

Replaced the fuel pin with the hungry diesel stage 2 has a he351 cw An 4 inch diamond eye pipe
1992 4x4, 4” diamond eye exhaust, nv4500, he351cw
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Re: THD fuel pin

Postby BC847 » Mon Nov 27, 2017 10:54 pm

THD does not have a "Stage 2" fuel pin. Only one pin, period. ;)
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Re: THD fuel pin

Postby 92cummins89 » Tue Nov 28, 2017 6:11 pm

Ima double check pretty sure it was bought from THD might not be a stage two it was a combo deal with a gov spring

Just don’t feel like it made a huge difference in power
1992 4x4, 4” diamond eye exhaust, nv4500, he351cw
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fuel screw!!!!
 
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Re: THD fuel pin

Postby spencerdiesel » Wed Dec 06, 2017 7:12 pm

There's a multitude of things that could be.

Also, whether your truck is stock power or 375 at the wheels makes a difference on your aspect. My stock truck got a new lease on life when I put the pin in
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing to the head/ >1/4”
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Re: THD fuel pin

Postby fatty » Wed Dec 06, 2017 8:55 pm

What pin did you replace? Have you checked to make sure the slide pin inside the pump is functioning?
91.5 w250
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Re: THD fuel pin

Postby oldestof11 » Sun Dec 10, 2017 8:28 am

What transmission do you have?
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93 D250~ Mismatch of cheap parts, trying to look fast going slow
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Re: THD fuel pin

Postby oldestof11 » Sun Dec 10, 2017 8:29 am

viewtopic.php?f=1&t=17631

Did you ever fix this?
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Re: THD fuel pin

Postby 92cummins89 » Mon Jan 22, 2018 9:36 pm

My truck only has a 4 inch diamond eye exhaust An he 351cw an a nv4500 trans

I just don’t feel like it did anything pin is installed correctly not sure if it’s I’m not getting boost or what now my front breaks decided to quit working when they were fine a week ago
1992 4x4, 4” diamond eye exhaust, nv4500, he351cw
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Re: THD fuel pin

Postby Remps » Tue Jan 23, 2018 7:53 am

You should fill out you sig so we know what kind of truck you have. Just adding a pin to an otherwise bone stock truck sure as heck won't give you 40 hp. Up to 40 hp with supporting pump mods compared to a stock pin, yes it's possible. Did you retune the starwheel and smokescrew after installing it? Did you get a boost gauge yet? The pin that makes more power will make more boost. (More fuel) You really need a boost gauge and a pyrometer so you can understand and diagnose issues.
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'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.
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Re: THD fuel pin

Postby 92cummins89 » Tue Jan 23, 2018 7:51 pm

Yea I need to get a boost An pyro gagues, but have been fighting my breaks on this truck, the carb on my jeep An trend in my other truck hard to figure out with one I want to commit too

Ever since I added the turbo (he351cw) I really feel like I lost a lot of power An doesn’t feel like it build boost mine is spring hated
Because when I put an empty 16’ lowboy behind my truck going up hill I lose speed
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Re: THD fuel pin

Postby Begle1 » Fri Jan 26, 2018 2:56 pm

I never noticed much with any of the fuel pin/ star wheel/ pre-boost screw adjustments on my truck.

The power screw is the "oh wow" adjustment. Once that's set right everything else is a tweak.



A pyro and boost gauge are almost a dynometer; they'll tell you if you're making the power you can be. You probably have low boost due to not getting on top of the turbo or something.
1990 D-250 Regular Cab: Tweaked injection pump, built transmission, a cataclysmic charlie foxtrot of electronics, the most intense street-ran water injection system in the country, and some more unique stuff.
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