Backup system if LP fails?

[TMoe]

Has anyone tried to run the engine without a LP by bypassing in tank pump? Just curious as it would be easy if in tank pump failed to connect fuel to 2 micron filter in engine compartment with a spare 3/8" feed hose from tank or a small tank of fuel in bed of truck, etc. Some mention the in tank pumps are getting better and they only cost around $120 at online Dodge OEM discount places. Found under Fuel system, Diesel, Fuel pump in Collision area. Any 05/06 out there with failed in tank pump at low miles not related to junk in the tank?



If pump died I would, ideally, connect input of 2 micron aftermarket filter to capped 3/8 fuel line routed to engine compartment after sucking on it to prime.

 

[Bodie]

It might work if you can get it started after all the fuel is sucked from the filter and lines.

 

[jelag]

We have an 04 with the engine mounted pump... when it failed we thought the boost pump we had installed would push fuel through the pump... no such luck... .



So we installed the in tank pump..... and before we took off the boost pump we tired to run it..... without the in tank pump running..... so we'd have a limp in mode... . nope... the frame mounted pump wouldn't pull enough fuel through the sock and pump in the tank to supply the engine..... so we removed it... ...



Just our thoughts... .

 

[rbattelle]

It might work if you can get it started after all the fuel is sucked from the filter and lines.

Good point. One reason Dodge has an electric LP is to avoid the need for a manual priming pump (like DMax's have). If your LP quits the CP-3 might need to be re-primed and I'm not sure the CP-3 pump could do it.





Ryan

 

[brods]

In theory you could make a passive system by mounting a drop tube in the tank with a check valve and teeing it into the existing fuel line right at the tank. When the in-tank pump runs, the check valve prevents backflow through the drop tube. If the in-tank pump craps out the check valve opens and allows flow from the drop tube into the fuel line, effectively bypassing the restrictive lift pump. Of course, the check valve has to have very little resistance to flow for this to work.



Big question is why go to all that trouble? If avoiding a break down is critical, just install a second complete system like the Glacier, or one of the many other brands available.