There is 3 types of fuel injection TBI (Throttle Body Injection One Injector) 9 to 13 PSI CMFI (Central Multiport Fuel Injection) 58 to 64 PSI CSEFI (Central Sequential Electronic Fuel Injection) 55 to 61 PSI
If you have the central injection system, you regulator is inside the plenum, next to the spider assembly. Takes about 20 minutes to get to it.
This engine should be CFI (central fuel injection) and the fuel pressure regulator would be under the upper intake manifold, attached to the "spider" (bank of injector poppets). The upper intake manifold needs to be removed to gain access.
Throttle Body Injection (TBI) Aprox. 9 - 13 psi with key on, not running and a 3 -10 psi drop when running at idle. Multiport Fuel Injection (MFI) Aprox. 41 -47 psi with key on, not running and a 3 -10 psi drop when running at idle. Central Multiport Fuel Injection (CMFI) Aprox. 58 -64 psi with key on, not running and a 3 -10 psi drop running at idle. Central Sequential Electronic Fuel Injection (CSEFI) Aprox. 55 -61 psi with key on, not running and again the 3 -10 psi drop running at idle.
If someone finds this answer it would be wonderful if they would share it. This is the exact question I need answered.
With key on engine not running pressure should be 9 to 13 psi Engine at idle pressure should decrease by 3 to 10 psi on a throttle body. On a multi port injection key on engine not running pressure should be 41 to 47 psi. Engine running at idle pressure should decrease 3 to 10 psi. Central multiport fuel injection key on not running should be 58 to 64 psi. Engine running at idle pressure should decrease 3 to 10 psi. Central sequential electronic fuel injection key on not running pressure should be 55 to 61 psi. Engine running at idle pressure should decrease 3 to 10 psi.
Vortex engine? Got me. I thought Vortex was just a brand of supercharger. I believe you mean Vortec engine.. GM also called this the L31 (they use 3 letter/number codes for everything) This system used a SCPI (Sequential Central Port Injection) system... and the fuel pressure regulator is on the central unit, which is INSIDE the intake manifold- you have to remove the upper intake manifold to get at it (plastic part), and the Fuel pressure regulator will be on one side of the central unit where all the fuel lines go to, it has a tube on it open to the intake manifold (to read intake vacuum)
"Central point" is basically like the old GM "Throttle Body Injection" system, where there is only one injector in the throttle body itself. Multi-port fuel injection has an injector for each cylinder, commonly in the intake manifold just before the intake valve for the cylinder. Some newer cars and trucks are now coming out with "Direct injection," in which the fuel is injected directly into the cylinder, similar to a diesel engine.
It could be the fuel pressure regulator is leaking fuel. If that engine is a CFI (central fuel injection), the fuel pressure regulator is located under the upper intake manifold and it can leak without being noticed. While you have the upper intake off BE SURE to check all 8 of the black plastic fuels lines that come off of each injector and hook to the spray nozzles they can also leak fuel into the engine oil system. Like he said it will probley be the pressure regulator.
THERE ARE TWO MOTORS FOR THE 1994 S-10 BLAZER. TBI (Z MOTOR) AND CPI (W MOTOR) Central Port Injection Throttle Body Injection. IF IT'S CPI THEN IT'S UNDER THE INSIDE OF UPPER INTAKE MANIFOLD. IF IT'S THE TBI MOTOR THEN IT'S ON THE THROTTLE BODY.
under the intake manifold mounted to the CFI (central fuel injector)
Throttle body injection should have 41 to 47 psi. Central fuel injection should have 60 to 66 psi.
maxillay central injection
If your engine is a 4.3L V-6 with CPI (central point injection) it is inside the upper intake manifold. The upper intake manifold is bolted on top of the normal intake manifold. The throttle body is mounted on it and your fuel lines terminate into the center of this.
The CSFI (Central Sequential Fuel Injection) system calls for 56-62 psi.
Central Sequential Fuel Injection (CSFI)
central port injection
Above 60 psi if it is a CPFI= Central Port Fuel Injection. wish I am sure it is, all Vortec engines have this CPFI.
Normal central venous pressure is in the range of 2-8 cmH2O.
On a standard fuel injected 4.3l V-6 the regulator is located under the intake plentum next to the central fuel injector. If u have never had one of these engines apart it can be a little tricky, use caution when setting the plentum back on.
Multi point fuel injection is the latest way to deliver fuel to the cylinder while sticking to ever increasingly hard emissions tests. A multipoint fuel injection system typically delivers fuel to each cylinder individually. (each cylinder has it's own injector) Central port fuel injection and carburetion delivered fuel to a central point.
The central pressure of the hurricane measures how strong the hurricane is. The lower the pressure is in the center of the hurricane, the higher the winds. If the pressure is very low, it is a very strong hurricane.
Should be 39psi on a multipoint or central fuel injection system. One with a mechanical pump/carburetor I think it's below 10psi, maybe 6-8 or so.
constant ? fuel injection CENTRAL SEQUENTIAL FUEL INJECTION (LOOKS LIKE A "SPIDER")
central venous pressure