What does "big hole" in the description mean?

From using the search button in Google… I gather it means that it has a larger orifice for fuel to flow. All I know is it did the trick on my 12 valve.

The part number list includes a 1997 6C 8.3 (4988747). Will this lift pump fit?

Yes，fit it，please buy it with confidence.

Will this fit the older 12 valve from a 93, or are the cams different?

Yes but you need a spacer and you need to replace the spring in it to make it a HVLP pump. You will blow the seals out of your 've pump if you don't.

Is the plunger in this pump a 26mm or a 30mm?

so far the only pump i have found that has the 30mm plunger ends in part number 747

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ADP Diesel Fuel Lift Pump 3936316 fit for Dodge Ram Pickup 6CT, Transfer Injection Pump 3936316 for Pickup Cummins 5.9L 6BT, 1994-1998 Dodge RAM 2500 3500 Pickup Cummins 5.9L 4988747, Dodge

ADP Diesel Fuel Lift Pump 3936316 fit for Dodge Ram Pickup 6CT, Transfer Injection Pump 3936316 for Pickup Cummins 5.9L 6BT, 1994-1998 Dodge RAM 2500 3500 Pickup Cummins 5.9L 4988747, Dodge

Product ID: 91423598

Details

Brand
ADP
Fit Type
Vehicle Fit
Item dimensions L x W x H
8.7 x 6.7 x 3
Material
Metal
Vehicle Service Type
Truck

⛽Precision diesel fuel delivery

📏Exact fit for 1994-1998 Dodge Ram 2500/3500

⚙️Durable metal gerotor design

396.80 DT

Duties & taxes included

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Description

⛽ Power your Dodge Ram with precision and reliability – don’t let your truck settle for less!

TRUSTED REPLACEMENT PART - Manufacturer part number 3936316 ensures authenticity and peace of mind for Dodge enthusiasts and professional repairers.
ROBUST METAL CONSTRUCTION - Built with high-grade metal and gerotor style for long-lasting durability under demanding truck conditions.
PRECISION FUEL FLOW CONTROL - Mechanical operation with threaded and hose barb connections guarantees efficient and leak-free fuel delivery.
ENGINEERED FOR PEAK PERFORMANCE - Rigorously tested to meet and exceed OEM standards for reliable diesel fuel transfer.
TAILORED FIT FOR ICONIC DODGE RAMS - Specifically designed for 5.9L Cummins engines from 1994-1998, ensuring seamless installation and optimal compatibility.

This Diesel Fuel Lift Pump is a high-quality, rigorously tested replacement part designed specifically for 1994-1998 Dodge Ram 2500 and 3500 trucks with 5.9L Cummins engines. Featuring a durable metal gerotor design and precise mechanical operation, it ensures efficient diesel fuel transfer and a perfect fit, making it the go-to choice for truck owners and professional mechanics seeking reliable performance and longevity.

Specifications

ASIN	B07DWRHG4K
Auto Part Position	Front
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#1,212,017 in Automotive ( See Top 100 in Automotive ) #8,388 in Automotive Replacement Electric Fuel Pumps
Body Material	Metal
Brand	ADP
Brand Name	ADP
Compatible with Vehicle Type	Truck
Connector Type	NPT
Customer Reviews	4.1 out of 5 stars 141 Reviews
Fit Type	Vehicle Specific Fit
Gas Type	Diesel
Inlet Connection Size	6.7 inches
Inlet Connection Type	Hose Barb
Item Dimensions	8.7 x 6.7 x 3 inches
Item dimensions L x W x H	8.7 x 6.7 x 3 inches
Manufacturer Part Number	3936316
Material	Metal
Material Type	Metal
Model Number	3936316
Mounting Type	Flange Mount
Number of Items	1
OEM Equivalent Part Number	4988747
Operation Mode	Mechanical
Outlet Connection Size	6.7 inches
Outlet Connection Type	Threaded
Product Style	Gerotor
Style	Gerotor
Unit Count	1 Count
Vehicle Service Type	Truck

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