What Fuel Pump?

[RSchwarzli]

I need a fuel pump for the Ramcharger fuel tank I picked up for the dual tank project. My question is are the gas and diesel fuel pumps the same? Can I use a diesel pump on the Ramcharger tank? The reason I ask that is that the Ramcharger tank is very shallow? Any one have any thoughts? Thanks,



Robert

 

[KSommer]

there is no pump in the tank, i think. .

just a pickup screen.

kent

 

[BHiggins]

KSommer is right, thereis no pump in the tank. Only the lift pump on the motor, which pulls the fuel from the tank and pushes it to the injection pump.

 

[RSchwarzli]

Are you guys refering to no pump in the Ramcharger tank or the Ram tank? I thought there was a pump in my tank. Was I wrong?



If the lift pump is the only thing sucking fuel, if I put a transfer switch on the truck to switch between the two tanks, will it still have the suction to run 18 feet (the length from the motor to the ramcharger tank in the back, with the crew cab frame)? Thanks,

Robert

 

[Philip]

The in tank pumps didn't come around till the 24 valve engines. Our Ve based 12 valves and the P7100 based 12 valves used lift pumps that were engine mounted.

 

[HRDROKN]

Are you guys refering to no pump in the Ramcharger tank or the Ram tank? I thought there was a pump in my tank. Was I wrong?

Yes we are speaking of the Ram tanks... as far as what was in the Ramcharger tank, I would have thought it would have had a mechanical pump on that gas motor rather than an electric in the tank?

 

[RSchwarzli]

Is there any limit on the distance a lift pump will pull fuel from?

 

[BHiggins]

I'm sure there is a limit as to how far the lift pumps will pull, but I don't think you'll reach it by installing an auxilliary tank at the back of the truck. I'm sure school busses equipped with Cummins engines pull alot further than what you plan to do.

 

[DonTX]

For what it is worth, my RV uses the Cummins diaphram pump to feed the injector pump, pulls it about 30 feed from the front tank to the rear engine.

 

[Philip]

The stock lift pump will handle the distance.

 

[MMiller]

Just don't run rubber hose all the way, I'd use steel line, and then short sections of rubber for connections, with clamps. I ran into problems running rubber hose on a 440, it would either suck air, or collapse the line when I had hose from the pump to the tank.

 

[cojhl2]

If you are going to swithc tank source back and forth remember you have a return line to consider. you must also swithch the return line with the suction line.

 

[RSchwarzli]

It will pull it then. Wonderful. That answers all but one question. If I have a switch going back and forth between the two tanks, will the fuel in the not being used line, bleed back into the tank creating an air lock? Thanks guys, all of your help is really appreciated.



Robert

 

[Philip]

If the fuel drains back to the unused tank that means you have a air leak in the line. Once you have fuel up to the transfer valve the first time it shouldn't drain back. The fuel was brought up under a vacuum. Once the vale is closed. There is no way for the fuel to move unless it gets air into the line.

 

[RSchwarzli]

Thanks so much.

Robert

 

[Jgolden]

As info:

I have a 5. 9 cummins in a front engine motorhome and the tank is midship and there is a walbro pump at the tank that delivers fuel to the engine diaphram pump.

An older gas motorhome (454GM) had a similar "booster" pump set up. The pump on the engine would not pull sufficient fuel forward with out the booster, to keep the vehicle moving. (learned this on interstate 40 a few years back when I became a hazard to navigation and turned it into a one lane road. )

Have not tried/or had to do without the booster on the cummins. It does gurantee fuel to the engine diaphram.

P. S. I also learned that no matter how many big trucks blow their horn at you it will not make your engine run.