Inline fuel pumps with intank pump

[FastRegalWE2]

can I run a second fuel pump, outside the tank, like an Aeromotive INLINE, plus the intank without sumping the tank???
PS this is not for my Buick but rather my Z28. I added N2O and going to add larger inj and another fuel pump so I can run a larger shot

thanks

 

[BOOSTEDGNs]

I dont remember exactly but if I recall my jeep I added an inline with my supercharger with intank pump,
and my mustang I ran new an fittlings/lines and ran a sx pump external that I had with the sump

Im almost positive you can run the added inline with your setup but since you are upping the power dosages to their limits,you might want to sump it


TTT for ya

Alan

 

[Blazer406]

fuel pump delima

Take it from me..... don't put an inline in series with your current in-tank pump. IMO, you don't get any more flow than the lesser pump can put out. You can add an inline pump, but drop your tank and remove the factory pump and replace it with a piece of steel tubing (I used a piece of brake line I got at autozone and trimmed to fit). I angle cut the bottom of the tube so it wouldn't suck flat to the bottom of the tank. Trust me....it flows much more... if your stocker is not up to snuff. If I were gonna go to all that trouble though... I would drop in a 255 LPH in tank replacement pump (walbro is a good pump). This should flow plenty down into the 10's probably.... and you don't have a noisy inline pump.

IMHO, the only time you series two pumps is to boost pressure... if one pump can't put out enough pressure by itself...otherwise.... don't do it. That is half-@ssing it.

HTH

 

[PhilM]

Parallel baby! Like Blazer said... I dont see any great advantage of doing it that way, even if the inlets can actually handle that sort of pressure.

I added a second intank 340, which will be triggered as a second stage wrt boost so that my return line isn't saturated with both running at the same time at low fuel demand conditions (ie idle). If you have someone that can weld, they can help you make the dual banger by adding a new, larger outlet line that is y'ed for both pumps. Add a small grommet for the added wiring and epoxy it to seal. Be sure to upgrade the ground wiring as well.

If you need the performance of a secondary pump, you might as well spend some time to gain maximum results... On another note, i think MSD is making a decent, cheap, inline (external) pump... you could delete the intank and just add a large "sump" line to the inlets of the pump(s).

Finally, if the current pump you have is stock GM, a 340 or similar will upgrade fueling over stock, probably enough to provide fueling required for your added demand. idk know what kinda flow you need though...

Regaurds,
Phil

 

[Cheeseburger]

Yes you can, i used to run a bosch 286 external pump with a stock intank pump inline.........worked great!

 

[Grumpy]

Yes you can, i used to run a bosch 286 external pump with a stock intank pump inline.........worked great!

old tech BUT it worked!! :biggrin:

 

[MIB]

My buddy was running external pump w/procharger on LS1. It starts to become a problem when you are @550hp. You can always add the extra pump for a little piece of mind. Stock heads, cams, headers and 150-shot works all day :biggrin: When you get to @430 or better on all motor before the shot then the extra pump will be the least of your worries. Keith and company ran 11.70's at VMP with just gears and 150-shot

 

[Blazer406]

Yes you can, i used to run a bosch 286 external pump with a stock intank pump inline.........worked great!

Did you flow test (through the regulator) before and after installation? I flowed mine into a graduated bucket. There was night and day...... black and white difference in the flow with the intank pump still installed and a cheap MSD inline pump in series with it. It was like a trickle coming out of my flow hose in the bucket with the two pumps. Once I saw that.... I knew that was no good.... I removed the in-tank stocker and replaced it with the steel tubing like I described in my previous post.... and reinstalled the sending unit and re-flowed the system through the regulator. No comparison. The MSD pump pumped waaaaaaaaay more fuel w/o the stock in-tank pump installed. I would like to see some evidence to contradict this.... but I don't think you will find any....

HTH