Fire up a second fuel pump based on boost via SPA?

[David_VT]

Doing some late night cruising on the web, I found an interesting application for the external boost signal that can be generated by the SPA gauges.

HOW ABOUT STARTING A SECOND FUEL PUMP BASED ON A PRESET BOOST LEVEL?

The SPA boost gauge can do it! (or those with the fuel pressure SPA could do it on the fuel pressure drop at the injection pump)

Without the SPA, one of our ever present electronics teams could make a box to run off the map sensor that could do the same thing.

Dual fuel pump in a 12second 89 Plymouth Acclaim: http://www.turbogearhead.com/enthusiasts/cars/cars_gus_acclaim.htm

(ps: check this powerful little turbocharged pickup!! http://www.syclone.freeserve.co.uk/index.htm)

(FYI:An interesting website from HOLLEY: http://www.nosnitrous.com/HiOctn/TechServ/TechInfo/FMFPTech.html )
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99' SB 4x4 : DDI's, HOT PE, SACHS Clutch(here 2/19 but still in the box),SPA dual gauge, ESPAR, Line-X OTR, Ladder bars, AMSOIL, etc (GPS,Cell,CB,... . )
Green Monster


[This message has been edited by David_VT (edited 03-28-2001). ]

 

[ynot]

Hey guys, I posted this on the 5 page Holley Pump thread, and no one really cared, but... with no other modifications to lines, banjo bolts, etc, and being on my third OEM Carter, I took a Holley 12-815 (Black) and mounted it in front of the trans crossmember where it goes from steel to plastic "pushlock" in line, and tapped the OEM wires that feed the stock pump, running them both full time (series). 15,000 miles with no probs. 23psi at idle, 17psi at 20psi boost in normal cruise, 14psi on PE3 with DDIII's at 50psi boost. Fixed and done. $150 and 1/2 hour lbr. You would have to go parallel to use them one at a time unless you put a bypass switch to route around the vanes of the "secondary" pump. The other way is relatively quick and painless. Good luck... T

 

[David_VT]

That falls under the 'KISS' method if you ask me. BRAVO!!

I guess loosing the tank pump could be one big issue as it would become line blockage.

I would think investing in fuel pressure gauges rather than all the line mods, and doing what ynott did would be a reasonable alternative to all the line mods??

OK, TDR what is wrong with this approach??

 

[csutton7]

ynott--I cared, but went with one pump instead(Barry Grant 220HR)-in the name of TDR R&D--your setup sure works good no doubt, but we will be able to compare different pumps and setups to get the best setup for us all--that's what we're working towards on the--I got the scoop on the lift pump thread. With your setup and Articat using the Summit pump and Mopar Muscle doing his thing, guys with the Mallory pump, Holley pump guys, the better Carter pump and the 3 of us(that I know of) with the BG pumps and all with some sort of plumbing diff's we have a good cross section to help us figure out the best setup along with the R&D on the filter/heater. maybe 2 pumps is the way to go we'll wait & see as the data comes in for the other setups(just going to be awhile)--this is too much fun ----chris

 

[MikeR]

David,

In the next two weeks I'll have two stock Carter lift pumps,and I don't know if I'll actually do it,but I've been thinking of a dual pump thing also.
Since I have a Powermax3 that of course has an on/off switch,I could wire in a relay that powers up when the PM3 is turned on. Since the PM starts fueling at a given boost,I can get the signal to activate the second lift pump to start working. I would mount and wire up a pump near the tank as the main unit,and leave the pump on the engine as the secondary unit.

If it works,this would maintain great fuel pressure when hot rodding. And when turned off,I wouldn't have to worry about too much inlet pressure at the injector pump while cruising in 'stock' mode. The only thing I don't know is if the main pump at the tank will push fuel through the (not running) secondary pump while I'm just cruising.

-Mike

 

[David_VT]

If you put the pumps in series, there might be some risk that the unpowered pump will act as a restriction.

One of the links above talked about having two pumps but clearly the users was running the two pumps in parallel and isolating the two pumps by some kind of 'check' or 'one-way' valving.