Only getting fuel to half the motor

[walsh910]

I put a 94 4.3 cmfi vortec in a 91 blazer swapped out wiring harness fuel tank and computer. Couldnt get fuel to motor untill we bled fuel off the line at motor several times when the motor fired up all the cylinders on the passanger side get fuel but the drivers side is not getting fuel when we spray fuel into the intake the engine smoothes out anyone got any ideas on what is causing this?

[MT-2500]

TBI injection?
Is both injectors spraying fuel even?
How is the fuel pressure?

[walsh910]

Its central multi port injection ill be checking the fuel pressure this weekend on it. i just thought it was odd that only one row of cylinders got fuel

[Leeann94astro]

Did you check/clean/put dielectric grease in the wiring connector for the spider?

[walsh910]

no spider it has poppets

[walsh910]

another thing i was curious about on the 91 s10 blazer with 4.3 tbi was their a fuel pressuer regulator on the fuel line somwhere that i have to switch out

[MT-2500]

What engine came out of the 91?
If you are using a 91 pcm/vcm and wiring on a 94 engine you may have a problem.

The fuel pressure regulator is in the intake.

Is all injectors getting a injector pulse.

How are you checking for no injector spray?

[Leeann94astro]

If it's a 94, you have a spider. The injector feeds the poppet valves. And the electrical connector to it is known to be picky/work loose/need to be replaced.

[walsh910]

OK here's some more info i took the engine out of a 1994 s15 jimmy took the wiring harness, engine control module and fuel tank an pump pulled the engine in late July of this year now we originally thought the reason the engine wouldn't start was a wiring issue until last Sunday when we were checking to see if fuel was coming out in a high volume off the feed to the engine the gas that came off it was bad so im wondering if there is a split off that feeds each side that could have been clogged by the bad gas now if that is the case im going to try running some sea foam through it to see if that takes care of it.
also on this coming sunday i will be testing fuel preassure but just wondering if my clog theory was possible

[MT-2500]

I would verify good fuel pressure first.
For the year engine you put in.

On the engine you put in is it a 12 wire plugin on top of intake to injectors or just a two wire feed to injectors?

Do you have any codes or check engine light on?

[walsh910]

its a 2 wire feed on this one ill have to get back to you on the rest wont be able to look at it till sunday

[MT-2500]

Originally Posted by walsh910

OK here's some more info i took the engine out of a 1994 s15 jimmy took the wiring harness, engine control module and fuel tank an pump pulled the engine in late July of this year now we originally thought the reason the engine wouldn't start was a wiring issue until last Sunday when we were checking to see if fuel was coming out in a high volume off the feed to the engine the gas that came off it was bad so im wondering if there is a split off that feeds each side that could have been clogged by the bad gas now if that is the case im going to try running some sea foam through it to see if that takes care of it.
also on this coming sunday i will be testing fuel preassure but just wondering if my clog theory was possible

They will not clog up unless you have let dirt or rust get in the injector.

On that on with the single injector all clinders are plused at on time from one injector.

If one side is getting fuel the other side should get fuel.

Also verfiy good injector pulse.
Good liuck.

[walsh910]

Well it was a bad fuel injector replaced it and now it runs great thanks for all the input