THD fuel pin install on stock pump

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THD fuel pin install on stock pump

Postby ggreenall90 » Mon Aug 07, 2017 1:39 pm

I installed THD's fuel pin in my stock injection pump and now when I shift from 3rd to 4th the truck will lug. Pump is completely stock other than the fuel pin and its a 5-spd getrag. Do I need to mess with the star wheel? Don't wanna turn the pump up at all.
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Re: THD fuel pin install on stock pump

Postby matthewh » Mon Aug 07, 2017 4:11 pm

I didn't when I installed the same fuel pin, and my pump is stock as well. I've got the same trans as you, though I've got 4.10's and duals.
Did you remove the plastic washer and bolt the pin right to the diaphragm? Or the little brass tube broken or loose where it bolts to the pump top? Did you face the ramp towards the front of the truck?
Just throwing out ideas,
'93 W350 5spd Getrag, 4.10 gears, 83k miles and counting, Mods: LPPP AKA Ma Dually
'54 Dodge M37 6.2/700R4/205, 5.89 gears, WC rear axle
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Re: THD fuel pin install on stock pump

Postby ellis93 » Mon Aug 07, 2017 6:08 pm

I'd drop the star wheel a turn and see if it helps. I installed an M&H pin with factory settings and my truck bogged like that. Moving the star wheel down helped.
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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Re: THD fuel pin install on stock pump

Postby spencerdiesel » Wed Aug 09, 2017 8:02 pm

Best pin there is in my opinion :)
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw 1 turn
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