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  1. #1

    Need opinions on Lowell BB 1390 tripple fuel supply

    I got a Lowell 1390 BB Speedwerx Triple pipe ski with stock carbs. I got a 180 main jet. Fa's, returns drilled. So it has the stock fuel pumps on the cards, is that good enough? Do I need external fuel pumps for more gas or can the stock ones keep up.


  2. #2
    WATER WOODY's Avatar
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    External pumps are great but i ran my 1500 stroked triple piped ported motor with Novi 48's and internal pumps with no issues. Put a fuel guage on and moniter your fuel pressure. I also ran a 100 jet in the return line and pressure never dropped and held 6.5 psi at WOT. If i did it all over again i would run the bigger external pumps.

  3. #3
    Quote Originally Posted by WATER WOODY View Post
    External pumps are great but i ran my 1500 stroked triple piped ported motor with Novi 48's and internal pumps with no issues. Put a fuel guage on and moniter your fuel pressure. I also ran a 100 jet in the return line and pressure never dropped and held 6.5 psi at WOT. If i did it all over again i would run the bigger external pumps.
    What size main jets did you have?

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