Are you sure your on the supply side at the TBI and not the return. Other than that I have no recomendations.

 

I bought a fuel pump for my truck and it would not work, it would pump but not enough pressure. I returned so many times they finally gave my money back and told me to go some where else. And i did, i went to the salvage yard and got a gas tank with the pump, installed it and it ran like a champ. All electrical parts from the discount parts stores are junk unless you buy AC/DELCO. Sure it cost more but last a long time.

 

mr.vls
I wish it was that simple.
I am on the larger of the which I think is 5/16.
The fitting that came with the actron kit is a banjo style which only fits on the larger.


papajim
I agree with you.
In case I had to go to the CPFI system I have been buying parts little by little.
They ARE ac-delco and Delphi.These are supposed to be original parts.
I ordered the parts from Rock Auto.com and found that they cost about the same as the foreign made stuff.
Found out some of the Delphi knock sensor were made in Mexico.
At least the same continent.
Thanks for your ideas and comments.
Keep em coming.

 

I have a suggestion that might narrow it down. With your pressure gage installed and if you can get the engine running I would pinch off the return hose to see what the gauge reads. If pressure builds up on the gauge I would then suspect the pressure regulator that is on the TBI. If no pressure builds than I would suspect the pump or a restricted fuel supply line. If you have access to air you could disconnect the fuel lines at the TBI and at the front of the fuel filter and blow the lines clear with air pressure.

 

That does sound like a good suggestion.I wonder if the rubber flex hose will be accommodating in this cool weather.
I don't work on Sunday,maybe try it tomorrow.
Thanks

 

Well I tried the experiment.
I took a c clamp and sealed the rubber line off.Had to prime the fuel.
It got up to about 10 psi and did stay there for a while.
Started the engine and man it shot up to around 18-19 psi.
Spray out the injectors was tremendous.To much actually.
The engine was idling really rough,so I loosened the clamp till I got to 10 psi.
Hit the accelerator and she again back fired up through the throttle body.
It always fires up on the even side of the engine (passengers side).

 

ah.. geez. Now we get back to 'zero'. what does "Had to prime the fuel." mean?
You mean you turned the key to run? And it only got to ten?

operating normally does it still not hold any pressure with key off?

Replace the the fuel pressure regulator. Evidently everything from the pump up to it works okay.

 

Yeah I thought about this after the post.
I figured I'd confuse the snot out everybody.Not intentional.Sorry.

When I start the blazer and run it then shut it down the pressure V___________drops
and flat lines.After sitting since Saturday,and then clamping the return guess it had to fill up the lines.I turned the key on 1st it went to 10 then dropped.
2nd the same.
3rd 10 then slow drop.
4th about 10 then stayed.
After running it and shutting it down,it dropped now,and pump ran for about 8 seconds.
Thinking seriously about reinstalling the original CPFI,only with NEW parts.
I wanted this experiment to work so desperately.
I about gave up a couple of weeks ago then I stumbled onto a forum that had a guy from Maine try this.He didn't modify the manifold or anything just disconnected the balance shaft and threw it together.
I kept reading waiting to see what his results were hoping I had missed something but he quit without even attempting to start it.
He instead installed his a v-8 from his mothers car.
Good for him I thunk but dang to not even try to start it?

 

It honestly sounds like the rubber line that goes from the fuel pump to the fuel line might be cracked and bleeding pressure. A delay in fuel to the tb makes me think you have a leak in your line somewhere. I am guessing you also tryed replacing the fuel filter?

 

Thanks for the reply.
Yeah,everything is new including the line inside the tank for the pump.
Also when plugging the line before entering the throttle body it builds up pressure and holds.So that would eliminate the fuel lines and pump.
Please keep up the suggestions...it might just save me the trouble of converting to CPFI tomorrow.
I would love that.