Fuel Pressure PSI

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diezelraccoon

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Interesting. Yeah, that seems like flex fuel label. Are you the original owner of this truck?


Can you post a photo of the injectors? The L59 are visually different than those from the non flex-fuel variants.

Things get swapped over the years and ownership. Possibly engine, glovebox or fuel door are not original?


For example:
On my 99 Silverado I swapped the engine from a V6 to an L59, transmission from a 4L60e to a 4L80e, and last year I deleted to center console to a jumpseat (including the glovebox with another truck's RPO code label.) I did keep my old glovebox, and I was going to swap the lid, but even then, stuff doesn't match exactly. LoL
Do I need to remove an injector or what does the pic need to show?
 
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diezelraccoon

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Your pump isnt meeting min spec at KOEO. Its done. Stay away from aftermarket pump modules unless you like changing fuel pumps...alot.
Can you link me to where you recommend? I usually only do OEM so in this case would be ACdelco more than likely.
 

strutaeng

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Your pump isnt meeting min spec at KOEO. Its done. Stay away from aftermarket pump modules unless you like changing fuel pumps...alot.
Looks like PO is 2 psi below spec. I would have thought this was close enough, but I don't know.

On my older SBC/4.3 Vortec, they always primed a few psi below spec, but still fired up. The spider injectors I always read really needed the minimum to fire, but mine didn't have that issue it seemed.

I'm still learning the LS engines, so that's why I'm asking.

I would still like to see OP cap the return line to see maximum pressure developed by the pump, in case maybe it's a fuel pressure regulator issue? IDK
 

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