is the fuel pump from a 89 dpfi to weak for the ls mpfi?

 

I would recomend upgrading... I have a D16y7 in my 91 Si and when i had to replace my gas tank i just threw in a Walbro 255 high pressure... its like $90 and id rather have the fuel pressure when i need it...


Modified by EFstyle at 7:18 PM 4/21/2008

 

thanks man we just swapped the ls and done everything man it just seems like its not getting enough fuel. and it wont rev past 4 grand.

 

The fuel pump is the same for the dx si etc etc.. it has more than high enough flow rate to run an ls, so that is most likely not the problem.

you are most likely in limp mode.. do you have any error codes? and what injectors did you use? if you converted from DPFI to MPFI and are using obd0 injectors, there is some wiring required to get the resistor box that you will need, otherwise, you should be running obd1 injectors. That is all assuming you did the wiring for the injectors correctly in the first place. Wiring is much more likely to explain your fuel issue than a fuel pump that *probably* worked before all this started.


Modified by sanimalp at 10:20 PM 4/21/2008

 

[QUOTE=I would recomend upgrading... I have a D16y7 in my 91 Si and when i had to replace my gas tank i just threw in a Walbro 255 high pressure... its like $90 and id rather have the fuel pressure when i need it...QUOTE]

did you have to run a aftermarket fuel pressure regulator?

 

we wired in the resistor box like it was said. and then we came across the two blue wires and ran them to the orange and white wire.

 

sorry we used the ls injectors, ecu, and resistor box. and dpfi harness.