SHANE Posted July 23, 2002 Share Posted July 23, 2002 well my wonderful paxton fuel pump left me on the side of the road yet again!! this has been on going since i bought the damn thing 4 years ago. i was warned that it was NOT a constant duty pump. so here is my idea, i have an MSD pump rated for 500 horsepower. i think i am going to buy another one and run them together. my sump has two outlets so they would both get enough fuel, then i could run the lines to a "Y" block and into my -10 feed line. this would all cost me less than half of what the paxton cost. well, am i carzy or will it work? shane Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted July 23, 2002 Share Posted July 23, 2002 Are you crazy??? WTF are you thinking???????? j/k - sounds like it should work just fine, lots of folks parallel pumps, and it sounds like your feed is plenty big. Quote Link to comment Share on other sites More sharing options...
BLKMGK Posted July 24, 2002 Share Posted July 24, 2002 Would this be a Paxton "blue" pump? Is it having to lift at all? I've got one but haven't put it to too much hard work yet.... Quote Link to comment Share on other sites More sharing options...
SHANE Posted July 24, 2002 Author Share Posted July 24, 2002 yes it is the "blue" pump. lift? i dont follow. Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted July 24, 2002 Share Posted July 24, 2002 BLKMGK, and others. The paxton, sx, aeromotive, are NOT designed to lift fuel. They have to be mounted lower than the outlet on your tank, or they will end up going bad. These pumps need to be primed by gravity to work properly. Evan Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted July 24, 2002 Share Posted July 24, 2002 Get a peirberg from Cartech. 200 bucks, it is quiet, flows 200 lph, and is encased in rubber. Quote Link to comment Share on other sites More sharing options...
SHANE Posted July 24, 2002 Author Share Posted July 24, 2002 BLKMGK, and others. The paxton, sx, aeromotive, are NOT designed to lift fuel. They have to be mounted lower than the outlet on your tank, or they will end up going bad. These pumps need to be primed by gravity to work properly. ALL gas tanks have the pick up in the bottom, the only way it could gravity feed is if it were to sit on the ground. except for in tank pumps, every other fuel pump must "suck" the fuel up hill. i just dont understand why a company would make a fuel pump that cant do what it is designed for. so it would need a second pump to feed it, right? there is no way in hell it could be mounted below my sump. sorry evan, my disgust is not toward you. shane Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted July 24, 2002 Share Posted July 24, 2002 Shane, i understand your concern. The design is somewhat weak. The pump WILL chew itself up if its not primed, or darn close. I have my pump mounted below the outlet of my tank, and never have any problems. Fuel pressure builds like flipping on a light switch. Crappy design yes... the reason I know is I got my pump from a camaro guy who had a couple shoot craps because of the way they were mounted. Personally, I hate the pump. ITs too frigging loud. Evan Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted July 24, 2002 Share Posted July 24, 2002 Even if the pumps are not too good at self-priming, I can't see how it's a concern mounting them at the same level or slightly above the sump. Before they are ever fired up, gravity will prime them, as I assume you will fill the tank before applying power... So even if you do run the tank low, since the pumps are primed, a slight pull, or draw, will not run the pump dry and cause it to "eat itself". If an electric fuel pump cannot deal with a 3"-6" draw, it is a POS. Quote Link to comment Share on other sites More sharing options...
SHANE Posted July 24, 2002 Author Share Posted July 24, 2002 Personally, I hate the pump. ITs too frigging loud. AMEN TO THAT!!! well i guess you have explained why my pump is shot. and actually you have done me a favor as now i know for sure that i am done with it, thanks! shane Quote Link to comment Share on other sites More sharing options...
John Scott Posted July 24, 2002 Share Posted July 24, 2002 Been running my Mallory 140 for 5 years in the stock pump location, bracket slightly modified. Its really pretty quiet, especially with the big lines. Why not change brands? John Quote Link to comment Share on other sites More sharing options...
BLKMGK Posted July 25, 2002 Share Posted July 25, 2002 John, is that Mallory an EFI pump? And yes, I knew about the pumps not being able to lift - hence my question. My Blu is setup pretty well on the Mustang, it's not got to struggle to prime. I wouldn't have one on the Z, it's too loud. On the Mustang it's louder than the blower! I have an Essex or Aeromotice for the Z but I may not use it, they're nearly as loud.... The Sump on the Z is pretty low but it's also easily gravity fed. Have foam in the cell too. Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted July 25, 2002 Share Posted July 25, 2002 I can describe the racket of the essex pump only as someone using a coffee grinder at 5am right next to your head. I cant hear it too well in my z, but it is way too loud. Evan Quote Link to comment Share on other sites More sharing options...
R0N Posted July 25, 2002 Share Posted July 25, 2002 Originally posted by SleeperZ: j/k - sounds like it should work just fine, lots of folks parallel pumps, and it sounds like your feed is plenty big. Shane, If you have a big enough return line you'll be ok. I put a single big pump on my stock 240Z fuel lines and even with the fuel pressure set at the lowest setting I couldn't get less then 80psi. Changed my lines and now I can go as low as 15-20psi at the lowest setting. Quote Link to comment Share on other sites More sharing options...
SHANE Posted July 25, 2002 Author Share Posted July 25, 2002 yeah when i fisrst got this swap done (like 6 years ago) i used the stock 240 return line. oops big time flood city Quote Link to comment Share on other sites More sharing options...
Guest Mr. Big Business Posted July 25, 2002 Share Posted July 25, 2002 So you are thinking ot this: code: _____ |--- paxton---| tank | |---- fuel line--- |---- other---| _____| So that you'll still have fuel pressure if the paxton pump dies, right? I'm not sure what the internals of a fuel pump look like, but do they prevent back-flow if they die? You might want to put a check valve upstream of both pumps, so that in case one dies, it won't just let the fuel right back in to the tank. Henry Quote Link to comment Share on other sites More sharing options...
SHANE Posted July 25, 2002 Author Share Posted July 25, 2002 your close but NO paxton pump, both pumps would be MSD. i was thinking that it would in a sense double the output. shane Quote Link to comment Share on other sites More sharing options...
John Scott Posted July 26, 2002 Share Posted July 26, 2002 BLKMGK, its not the efi pump. With the set screw all the way in, as Mallory recommended for my supercharger, gave me 20+ psi. Probably not enough flow for a healthy supercharged engine at those pressures, but worked great for my V6. At carbureted pressures, 7psi, flows a ton. 600 hp engines, according to one article I read. Flows great @ 7psi. Wiper washer is louder than the pump. John Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted July 29, 2002 Share Posted July 29, 2002 You might try looking in to the Walbro pumps as well. They make a couple 255lph inline pumps that work very well. They have a "low pressure" and a "high pressure" depending on your application. If you wanted to get really trick, maybe you could have a checkball downstream of the second pump and have it only come on when activated by a Hobbs switch or something . . . just an idea to help complicate things Quote Link to comment Share on other sites More sharing options...
Jason81NA,82RBtt Posted July 31, 2002 Share Posted July 31, 2002 I have the MSD pump istalled on my 81 (N2O)n-turbo and it is working great. With my ZEX kit it up's the fuel pressure to 90 psi when on the nitrous. With other pumps I could not get that psi or they would not flow enough at that psi. So I think you idea is a good one! Jason Quote Link to comment Share on other sites More sharing options...
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