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- 1st Generation S-series (1983-1994) Tech (https://blazerforum.com/forum/1st-generation-s-series-1983-1994-tech-40/)

- - Fuel pressure (https://blazerforum.com/forum/1st-generation-s-series-1983-1994-tech-40/fuel-pressure-26298/)

harpnicholas

01-05-2009 01:32 PM

Fuel pressure

I have a 93 s10-blazer with a 4.3 that wont start and i was woundering if any one konws what the fuel pressure on that vehicle is suppose to be at key on engine off and key on engine crank

swartlkk

01-05-2009 01:40 PM

RE: Fuel pressure

TBI or CPI?

harpnicholas

01-05-2009 01:42 PM

RE: Fuel pressure

it is TBI

swartlkk

01-05-2009 01:46 PM

RE: Fuel pressure

I believe it is in the 8-10psi range. You will need an adapter to be able to test the fuel pressure at the TBI unit.

harpnicholas

01-05-2009 01:49 PM

RE: Fuel pressure

ok them i was wrong it is the one with a main injector in the center of the intake

swartlkk

01-05-2009 01:55 PM

RE: Fuel pressure

Ok, for the CPI engine (the one with the plastic cover with the word "VORTEC" molded into it), the pressure should be 52-60psi for proper operation of the pressure actuated poppet nozzles. The fuel pressure test port is located off the back of the intake near the brake booster.

harpnicholas

01-05-2009 01:59 PM

RE: Fuel pressure

so on crank ist should be 52 on crank or with key on engine off

swartlkk

01-05-2009 02:17 PM

RE: Fuel pressure

It should be at least 52 psi. It should never fall below 52psi which is near the minimum pressure required to open the poppet nozzles.

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