4.3 questions?

mike d · Apr 14, 2008

I put a 98 4.3 Vortec in my 95 v6 4Runner. Im using the stock GMC harness. Downey says that i can use my stock fuel pump, I have everything wired up. I can crank it over, and all my ignition is hooked up bla bla bla. As of right now i cant get it to start up. After doing some reading and asking howell for some documentation for using my stock harness, there manual states that i must have a fuel pressure of 60 to 65 PSI. I be live toyotas efi pumps run at 45. Am i wasting my time using the toyota pump? Also if i don't have my Check engine light on the toyota hooked up to the MIL on the gmc ECM, would that not let the motor start, I wouldn't think so, but i figured i would ask. I have lots more trouble shooting, but it gets loud in a condo garage at night with open pipes and i cant keep cranking it over right know to late. Guess i will wait tell the daytime to continue with the testing.

THANKS

crash2 · Apr 14, 2008

mike d said:
I put a 98 4.3 Vortec in my 95 v6 4Runner. Im using the stock GMC harness. Downey says that i can use my stock fuel pump, I have everything wired up. I can crank it over, and all my ignition is hooked up bla bla bla. As of right now i cant get it to start up. After doing some reading and asking howell for some documentation for using my stock harness, there manual states that i must have a fuel pressure of 60 to 65 PSI. I be live toyotas efi pumps run at 45. Am i wasting my time using the toyota pump? Also if i don't have my Check engine light on the toyota hooked up to the MIL on the gmc ECM, would that not let the motor start, I wouldn't think so, but i figured i would ask. I have lots more trouble shooting, but it gets loud in a condo garage at night with open pipes and i cant keep cranking it over right know to late. Guess i will wait tell the daytime to continue with the testing.

THANKS

45 isn't going to be enough.....

mike d · Apr 14, 2008

crash said:
45 isn't going to be enough.....

Crapola, Ah, watch ya recommend. I should tell Downey to quite printing that crap in there manual.

crash2 · Apr 14, 2008

mike d said:
Crapola, Ah, watch ya recommend. I should tell Downey to quite printing that crap in there manual.

You want a pump that max's out around 90psi

The poppets in the injector don't even blow off till 40psi

mike d · Apr 14, 2008

Yeppers, Just read that. Crap!!!!! Whats cheaper finding a used stock vortec pump or getting one from jegs or summit. Or i guess i could not be a lazy ass and look my self.

Thanks for the help.

Mike

crash2 · Apr 15, 2008

Frame mount--bullet style I can't remember the damn carter #...

mike d · Apr 15, 2008

crash said:
Frame mount--bullet style I can't remember the damn carter #...

Maybe? Didn't have the pressure specs.

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