Started my conversion. Need Help. Please

[chadapcb]

Ok as of now this is what I have found out.

Motor will run while spraying starting fluid.
during this running the injectors are pulsing

Installed a electronic fuel pressure gauge
During start up it is running 13.5 pounds
after the key is let go it is running right at 13 pounds
once engine dies it takes fuel pressure to die off about 20 secs

map sensor is registering correctly
tps and iac are new
ect is new 2.89 kilo ohms which is 2890 ohms its about 75 degrees outside

Distributor is new
Fuel pump is new

What have I missed

spark plugs wires and coils NEW

[chadapcb]

Ok she is alive and running.

BUT, and there is always a but.

I kept omitting the fuel pump.

The fuel pump is a SP1175 12-26#'s pressure with 50 to 58 gph

Even tho I was getting 13# pressure it wasn't enough

I completely blocked the return line to the tanks.
Brought the pressure up 24# pressure cant run like this as the pump is straining.

Where do I need to look.

I know it is the fuel side and only thing I have done is blocked return line.

So is it the regulator or is it the pump

[???]

should it running off a stock tune? like have you loaded up a known good bin for this setup?


cause if you're trying to run a boat motor off a stock truck chip. wouldn't it require tuning? clamping off the return line is the same thing a fmu does for a super charger car to get more fuel passed the injectors without tuning. it's a bandaid thou.

[chadapcb]

No I have a modified boat chip for my 7747.

Also little more info.

My tbi has a modified FPR. I have it set at 20 psi and it still doesn't want to run. But as soon as I block return then it jumps to 26 psi and runs good.

Confused on where to look.

FPR is maxed out at 20 psi.

[chadapcb]

Ok just a good ole update. And maybe it will help a few ppl.
The normal small block Chevy loves 12-13# fuel pressure
The vortec series requires 26-30# of fuel pressure.
So if you switch heads and run vortec heads you are and you will bump up the fuel pressure. Currently running 28# of fuel pressure.

engine timing. 12 degree before TDC idle at 750. Marine application has to be a little higher.

Ty to everyone that offered help.