I have an 89 3500 crew 4x4 with an HT 502 currently running 33s with the factory TBI and th400. I get 9 MPG. I’m about to upgrade to a ProFlo4 fuel injection and a 4l80e. Mainly to drop the rpm at highway speeds but hopefully I’ll squeeze another couple of mpg out of it.
You seem to know more than most about the electrical system than anyone I’ve found so far. I’m hoping you can help me.
I am planning to swap my stock TBI to the Pro Flo 4 EFI. That system switches the fuel pump on the negative side. Do you know how I can run my dual tanks with the negative...
You seem to know more than most about the electrical system than anyone I’ve found so far. I’m hoping you can help me.
I am planning to swap my stock TBI to the Pro Flo 4 EFI. That system switches the fuel pump on the negative side. Do you know how I can run my dual tanks with the negative...