[QUOTE=Captain Hook;640126]55-60psi at the service port is definitely a problem. With those readings, the problem could be in the plenum or in the tank. Checking fuel pressure & leakdown at the fuel filter outlet will tell you where the problem is. Just because the pump is new, doesn't mean it's good. You'll need an adapter that goes from the fuel filter outlet directly to the fuel pressure tester. All pressure & flow must end at the tester, with no fuel allowed to the engine. While the pump is running, pressure must be 73-108psi, and it must remain above 55psi for at least 10 minutes after the pump shuts off. Here is a parts list for building the adapter:

Thanks for the parts list, I will pick those up this weekend and give it a shot. I wasn't aware that the psi had to be so high for so long coming from the pump. The first test I ran at the Schrader Valve by just turning the key on was 35psi with a bleed off of pressure(drop to 0psi in about 5 sec.) then the next three immediate tests were 55-60 with the same bleed off. I will definitely be checking like you suggested though that sounds like it will be more definitive.

Thanks

 

Thanks for the parts list, I will pick those up this weekend and give it a shot. I wasn't aware that the psi had to be so high for so long coming from the pump. The first test I ran at the Schrader Valve by just turning the key on was 35psi with a bleed off of pressure(drop to 0psi in about 5 sec.) then the next three immediate tests were 55-60 with the same bleed off. I will definitely be checking it like you suggested though that sounds like it will be more definitive.

Thanks

 

for future reference

https://blazerforum.com/forum/2nd-ge...anifold-85686/

 

Quick update. I found that I had put the new distributor in one tooth off and that was causing the computer to slowly retard the timing to compensate for it. So I completely redid the installation(doing it right this time) and it fired right up and now runs like new. I didn't replace the injectors due to lack of funds but it sounds like they have a good track record so I'm not going to worry about them right now. Thanks for the advice.

 

When/if the distributor is off a tooth, P1345 sets in memory and the SES light comes on. It does not affect ignition timing, but it definitely will cause some serious crossfire in the distributor cap, (serious misfire).


This is a problem. Could be a failing pump. Might want to check it before it leaves you stranded