Intank Lift pump

[Sgt Craig]

I just installed a intank conversion on my 03. It has 146k on it and figured it was time to change it out before I was stranded in the middle of BFE. While doing the swap I was looking at the fuel pump module i was wondering if anyone thought of making a upgraded/highflow pump for the intank setup. Ive had alot of experience with converting stock modules in 420a Eclipses,4g63 Eclipses,neons,SRT4's,PT's Ect all with Added Turbo systems. They would run 35-50PSi at idle and anywher from 90-100psi under boost. Easily making 400

+whp on some vehicles with no fuel problems. We used Walbro pumps which cost around $100 or so. I dont think it would be difficult to remove the pump from the module,just care would have to be taken not to break the mounting arms off. Does anyone know what pressure and volume the intank pump makes from the factory? Any thoughts or comments.

 

[MFalkinham]

Gypsyman just came out with some interesting reading about the in-tank lift pump design.....

http://www.glacierdieselpower.com/images/PDFs/IntankPumpExposed.pdf

 

[sscribner]

Thanks for that link, that was very interesting reading. My lift pump was dieing and replaced under warranty with the new in tank pump. I found out the hard way that the fuel sender does not read the same as before and ran out of fuel before the gauge even reached the empty mark. I guess I will keep it at least 1/4 full all the time from now on. Heck, that will even make the fill ups seem cheaper.

 

[Sgt Craig]

I think you might be able to bypass or block the stock return and use a regulator to bump up the pressure. I wish I had some pics of how we did it on the Neons but it Would be a similiar set up with the return feeding fuel back into the canister so it doesnt get starved. That was some very interesting reading.

 

[TriSum]

Very interesting read. So at what point is it that the fuel pump cannot keep up with fuel demand?

 

[tobrien]

Thanks for that link, that was very interesting reading. My lift pump was dieing and replaced under warranty with the new in tank pump. I found out the hard way that the fuel sender does not read the same as before and ran out of fuel before the gauge even reached the empty mark. I guess I will keep it at least 1/4 full all the time from now on. Heck, that will even make the fill ups seem cheaper.

so our 34 gal tank is now a 25 gal tank. . what's wrong with this picture?

 

[steved]

Very interesting read. So at what point is it that the fuel pump cannot keep up with fuel demand?

IMHO, when the guage reads zero, the LP is starting to fall behind the injection pump demand... at zero PSI, the pump is just meeting the delivery needs and is at max flow... once beyond that, you should start pulling a vaccuum with the injection pump (if you had a guage to read that)...



steved

 

[EB]

Thanks for that link, that was very interesting reading. My lift pump was dieing and replaced under warranty with the new in tank pump. I found out the hard way that the fuel sender does not read the same as before and ran out of fuel before the gauge even reached the empty mark. I guess I will keep it at least 1/4 full all the time from now on. Heck, that will even make the fill ups seem cheaper.

I found the same thing. I ran out of fuel twice at about 3/8 of a tank. I also found out that with the in-tank pump (at least on my truck) anytime you get below 3/4 tank of fuel you are pulling 0 on the fuel pressure gauge. I was told it was OK by Dodge because they measure volume, not pressure. Can you figure that out? I put on a BD Auxiliary fuel pump and now I have pressure. If I have a pressure reading, I know I have fuel flow.