Engine/Transmission (1998.5 - 2002) In-Tank lift pump exsposed

[mhenon]

Anyone read the article by Richard Martin (Glacier Diesel Power "http://www.glacierdieselpower.com/index. asp" ) on the in-tank pumps?

It seems the pumps are actually quite beefy but most of the flow gets by-passed before getting out of the tank. When they tried plugging up the by-pass system, within the pump module, the pump pushed out a decent 19psi. At that point the pumps internal by-pass kicked in. Wonder why the manufacturer added the external by-pass and set it at 8 psi (which is what most of us see out of these pumps)?

He had some good photo's of the whole affair and how it operates. His best advice was to keep the tank from getting too low on fuel. If it goes much below a quarter tank the fuel has to enter the module from 5 small holes in the foot of the pump. Just more restriction on the system.

Anyway, check out the "tech articles" on Glaciers web-page. I finally got to see what DC put in my tank. I still don't like the low pressure. . but the pump itself looks OK.

Mike

 

[DAN V]

I just had my lift pump replaced with the new in tank retro fit by thge dealer a few weeks ago under warranty and it seems to be holding up. I keep an eye on the pressure when I am driving and it does seem a little low but i am planning to add a second pump after i hit 100k.

 

[mhenon]

That's just what I'm about to do. Going with the Vulcan Big Line kit. With the in-tank pump acting as a pusher to the Carter I'm guessing pressure will be 20+ at idle. With the two pumps in series, 1/2" fuel and no banjo fittings there VP will get all the fuel it needs.

I just get a little scared staring at 4 psi while hauling 10k lbs of trailer down the hyway. This set-up should ease my mind.

Mike

 

[DAN V]

the pump I am planning to go with is the carter 4600 from summitracing.com and I plan to add a relay also. This pump puts out 8 psi max so it shouildn't peg my 15 psi fuel gage.