Heres is my fuel pressure, what does this mean?

Anyone know how to install?

 

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Ok so I installed it and truck sat overnight and this was the cold start. When my lil sis turned it to ‘on’ it wouldnt get any pressure, what does that mean? Bad pump or? After we turned it on it did that hiccup where it wanted to turn off but turns right on right away and sat at 45psi.

 

Sorry more like 47psi*

 

Can you tell us what year and engine is in your truck?

 

The Fuel Pump is only energized when cranking or the engine is running

 

97
3rz
auto
4x4

 

gotcha, so is my pump okay?

 

From what you posted it seems to be.

 

So I can rule out the fuel pump…. how can I tell if its the FPR or the fuel filter or the injectors?

 

Fuel pressure spec is 38-44 psi.

 

That was cold start, ill recheck after its warm or does it matter

 

I don't believe it should matter. Does it hold that pressure for at least 5 mins when not running? If not, could be fuel pressure regulator.

 

dropped to 40 in like 4minutes

 

after i shut off

 

I'm still not sure exactly what is happening. Does the truck start and run? I think you mean it is not starting, but based on fuel pressure reading it is getting fuel to the injectors. True?

The easiest things to confirm before tackling the fuel pump are the circuit open relay which is under the dash near the steering column, the fuel filter not being clogged, the fuel pressure regulator (by the power steering reservoir), and fuse.

But seeing as how you have 45 psi, if it's not starting, it may be something other than your fuel delivery system. Maybe you MAF or some other sensor is telling the ECU not to inject any fuel.

 

truck always turns on. just hiccups on the first start (cold). Changed coils, wires, & plugs. No maf sensor cleaner anywhere (national shortage) but this maf is like a year new (on my 2nd one, already replaced).

 

Cold

 

Warm

 

after 5 minute shutoff