I have a FASS on my truck 98 12v and it was going to the factory lift pump.
Now i have been fighting leaks and actually ended up breaking the feed line from the filter housing to p-pump feed line.( I think this is from the number of time I have had it off)
My question is can I just go straight to the p-pump with the 15psi I see out of the fass?
If I cap off the p-pump feed line from the filter housing will the injector return still have a place to go?
Where does the return line return from?Filter housing somewhere?p-pump return?
What goes where?
Any help would be great...And Pics would be even more awesome.
mike

 

Fass has a kit to run it right to the pump. The return line you can get a-n tee fittings to splice in the feed line and then come off the top of the tee with a hose barb and run a piece of hose from the return line to the tee. You could actually use hose barbs on all three sides but i would prefer not on the main line so that is not resticted down any. P-pumps generaly like 20+ lbs for stockers and built pumps prefer 40 lbs constant. I would see if you could get a stouter spring from fass and bump the psi up to atleast 20. Sorry i dont have any pics. Tim

 

P-pumps love pressure I would not put a 15PSI pump right to the P-pump it is not enuff pressure.....I run my 150/150 to the stock LP and then to the P-pump 60PSI constant with a aeromotive regulator on the return side of the pump....
Brandon

 

You need more pressure Mike...40-45psi is optimal on a p-pump. Depending on what model FASS you have, they should be able to bump up the pressure to accommodate!

Chris

 

Brandon, how come you don't run that 150/150 right to the pump. That should do 45 psi. You want the pressure, but also want the fuel. I would think that bypassing the stock pump would flow more fuel. You have 60 psi now, but are you getting full fuel? This is not a sarcastic comment, i was just curious to what you think.

Signature600, those psi's are accurate, but the stock pump only does between 20 to 32 psi with a stock unchanged overflow valve. His sig doesnt say if he is high performance or stock though. If he is stock he could run a consistant 20lbs and be good to go with what he has.

 

Correct...but I was assuming he wasn't stock, and more fuel is better for the pump than less. I also have mine setup on a regulator so it forces all excess fuel through the pump for cooling.

Chris

 

That works for me. I guess i just assumed he was stockish because he didn't list any cool mods like most people do when they get them. I have been thinking about getting the fass 150/180 200gph at 45 psi for my new project. I think that oughta take care of a 550cc pump. Tim

 

I'm running the HPFP 150/180 @ 50psi, and it's holding PERFECT for my 550cc's. Brandon is running 550cc's as well

Chris

 

Sig600, i see you are in ohio. I deal with Terry Schafer alot. Do you deal with him?

 

Sig filled in sorry

 

Terry Schafer...don't know that I know him. Should I??

Chris

 

He is Powerparts Engineering by Columbus OH. I just didn't know if you dealt with him or not. He builds quite a few cummins motors for pulling trucks and also build his own clutches.

Mikcon, that is what we needed to see. Yes you deffinantly need more fuel to that pump 20 psi is not nearly enough for that. I heard that Engineered Diesel has a budget mechanical lift pump that you wont ever have to worry about again. Tim

 

Haven't dealt with him...might need to though

Chris

 

I have the 150/150 at 15PSI .........
Brandon

 

FWIW, after I did my conversion, I ran my 150/150 at 18 psi for a couple months, drove fine, still had plenty of power. I upgraded to a 150/95 45psi unit, and there really isn't much difference in how it drives. My pressure is fairly constant in the 27-30+ range (unstretched OFV). This is just on a stock 215 pump with a plate and springs though, nothing fancy.