Were to relocate fuel pump?

[GotDodge]

Ok. I got a new fuel pump from cummings. My question is. Should I relocate the pump by the tank and leave the other pump at the engine? Or should I get rid of the pump at the engine? Puting the pump at the tank---Can I put it on top of the tank or is it better lower on the tank? If I leave the pump at the engine and it goes out---Will it buypass the fuel threw to the engine? I really need help on this issue. 0 at WOT

 

[Todd T]

wooaah easy on the coffee, fella

that was a mouthful



what seems to be working is to leave the factory lift pump on the engine and add a second pump at the tank.



actually you will want to place the pump on the inside of the frame rail, in front of the tank. and you may, while your at it, install a filter between the tank and new pump. some guys (myself included) have been using a lift pump, the same as what is on the engine for the rear pump too. I have had mine on for almost 20,000 miles now with no troubles. others have used everything under the sun including a Malory setup. do a search for "lift pump" and also look for a thread from Big Saint, he has the Malory setup and knows quite alot about it.



you can buy a kit for the lift pump style setup from either: Enterprise Engine Performance (not sure of their website) or Advanced Diesel Technology @ www.Smokindiesel.com

 

[JR2]

I moved my lift pump to the rear by the tank... been that way for a few thousand miles, no problems yet... click on the link in my sig to see a picture of it. .

 

[Todd T]

Jr2 are you runnig just the one lift pump at the tank?



what kind of pressures are you seeing? also at WOT if you have them. i'm just curious

 

[bigbrassmonkey]

lift pumps

if the original pump quits, you will not be able to pump through it because it is a veined pump, the 2 pump scenario is for the carter set up, they will work as a set or one by it self if one quits, you might want to try the new factory pump in its required place, and a low pressure carter at the tank to "lift" the fuel to the pump, or dump the OEM parts and go after market,



I tried both ways, one pump, two pumps, and ended up with two carters now with thr braided lines, and they replace the banjo bolts to, adv diesel, sellls the whole setup for + or - 300



www.smokindiesel.com

 

[JR2]

Yup, just one stock lift pump in the back. I have replaced all the lines and banjos with -6an stuff. As far as fuel pressuer goes I have 10-12 at idle and somewhere around 2-5 at WOT. I need to replace my pump with one of the updated ones and I think all will be fine.



BTW - the SS lines came from Brandon

 

[tjpatte]

bigbrassmonkey, our stock pumps are Carters (at least the replacement for mine was?). I think you mean the Malory's. As for the back by the tank mount I wonder what us short wheelbase guys can do? Our fuel lines go inside the frame behind the fuel tank



Any Ideas??



Tom

 

[Bigsaint]

GotDodge, I would mount it on the frame, near and slightly below the tank, as stated above. Doesn't really matter whether you are running a Mallory, Carter, etc. lift pump, they all would rather push rather than suck fuel to the VP44. No offense to the two pump crowd, but I believe that one good pump is enough, atleast for me. Why have to worry about two pumps, when you it's enough to worry about one. Just my opinion. If you are going to mount the pump near the tank, a pre-filter might be a good idea. I use an Earl's screen type filter, many are using a Racor design with good sucess. As long as you pick a filter with a good flow rate, it surely won't hurt your set up and may just prolong the life of your pump. Hope this helps !!!



tjpatte, why not just cut the inbound hardline where it exits the frame, and add either a compression fitting (if your using braided line) or slide and hose clamp the inbound 3/8" rubber line over the hardline. Then you could run your inbound line along the frame and connect up front to your fuel filter housing. I haven't seen the way the stock line runs on the short beds, but I believe a few members with short beds have added a pusher pump, maybe they can help you with what they did.



Scott W.

 

[tjpatte]

Hey Scott,



The problem is on the shortbeds is that the fuel line is already inside the boxed-in part of the frame before you can get to it (gas tank covers it up.



Tom

 

[Bigsaint]

Tom, gotcha. I'm sure that I remember at least one memeber with a SB and a relocated pump. Maybe they dropped the tank and ran a new line straight to the pump ? Seem's like more work than you need to do unless there is no alternative ???



Scott W.

 

[Steve St.Laurent]

tjpatte, check out this thread - https://www.turbodieselregister.com/forums/showthread.php?s=&threadid=21898 . There's a pic about halfway down from ToddT showing where he mounted a pump on his short bed. In his case at least it looks like the fuel lines run outside of the frame rail on the inboard side. Maybe that pic would help.

 

[tjpatte]

Thanks for the info guy's. However on mine the fuel lines are inside the frame until about halfway up the truck



Tom

 

[Steve St.Laurent]

If you look at the front of the tank are the lines visible there? If so then your truck is the same as all of ours. The pickup comes out of the tank at about the mid point of the tank and the lines are obscured behind the tank until they are visible at the front of the tank. We've all mounted our pumps right in front of the tank. The specs for the carter pumps call for them to be within 3-4 ft feet of the pickup and that point is within that. The picture of ToddT's pump is at the forward most point of the fuel tank - I'd be surprised if yours is any different - but I could be wrong.



-Steve

 

[tjpatte]

Sorry Guys your right. I had it backwards. When I mounted my rocker guards I had to drop the tank so I could get the lines out of the way when I was drilling.



Thanks



Tom

 

[tobaccogrower]

3/8 rubber fuel line

this may be a stupid thought... ...

why not run rubber line all the way up to the fuel filter and bypass the stock lift pump? ... james

 

[Ramafid]

I relocated my lift pump to the frame-rail with the new imprved lift pump from Cummins. (3990105?). I am at 14-14. 5 at idle, 12-12. 5 at 70mph, and 9 at WOT. Couldn't be happier with the results.