No fuel pressure at the rails after mpfi conversion

[bowtiegoon]

So i have 1999 k1500 4x4 with the 5.7l vortec. I have installed the following within the past year (alternator, fuel pump, fuel lines, fuel filter, distributor cap, plugs/wires, starter, ignition switch). I just did the mpfi conversion and now the truck won’t start, the truck ran and started fine before i did the conversion but with a po304 missfire. I’ve double checked all the plugs twice. The only thing i think it could be is the fuel pump relay but it worked just fine the day before. Thank you for any help, i couldn’t find a thread with my same issues so i created this one.

 

[Pinger]

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[454cid]

No fuel pressure where and how do you know that?

 

[bowtiegoon]

No fuel pressure where and how do you know that?

The shrader valve at the fuel rail is bone dry

 

[Crazydavez28]

Jumper the relay and see if the pump runs. Pop the schrader valve if the pump runs. If the pump runs and no fuel, you are out of gas or the hose in the tank has disintegrated.

 

[Supercharged111]

Jumper the relay and see if the pump runs. Pop the schrader valve if the pump runs. If the pump runs and no fuel, you are out of gas or the hose in the tank has disintegrated.

I put a used pump assembly in my 98 that I had laying around and the internal hose split and eventually failed.

 

[454cid]

Jumper the relay and see if the pump runs. Pop the schrader valve if the pump runs. If the pump runs and no fuel, you are out of gas or the hose in the tank has disintegrated.

As silly as it sounds to unknowingly be out of gas in your own yard.... I did it with my Buick. I could not get the thing started and to stay running. It would only run on starting fluid. I suspected ignition troubles, since I don't think all cylinders have been firing any way, but after a few times of pouring gas down the carb and it running, I started to suspect fuel supply, which was about the time I was noticing low fuel in the filter (plastic see-through) and decided I'd put a couple of cans of gas in it.... that was it! I should try to start it again today, so I can mow around it.

 

[alpinecrick]

As silly as it sounds to unknowingly be out of gas in your own yard.... I did it with my Buick. I could not get the thing started and to stay running. It would only run on starting fluid. I suspected ignition troubles, since I don't think all cylinders have been firing any way, but after a few times of pouring gas down the carb and it running, I started to suspect fuel supply, which was about the time I was noticing low fuel in the filter (plastic see-through) and decided I'd put a couple of cans of gas in it.... that was it! I should try to start it again today, so I can mow around it.

This sounds like something I would do to myself.

Only I would have the engine halfway tore apart before I discovered the real problem........