This forum helped me last year with the installation of a retro fit high/low fuel pump on a 95 PCM Ford 351.  I installed it at the end of last summer, ran it maybe once or twice on the lake then parked it and drained the water out of the motor for the winter.

This past weekend, I got it out and it cranked right up, ran it for a while, cut if off, let it sit and cranked it up several more times and it ran just fine.  The fuel tank barely had maybe 2" of fuel in it but I did not pay attention to the actual fuel gauge, I had taken out the back seat to clean it so I could see that tank.  

I took it to the lake and put 16 gallons of fuel in it, put it in the water and took off out into the lake.  After about 3-4 minutes, I noticed it started losing power and bogging down.  Then I heard some knocking under the hood and it cut off.  I had also noticed the the fuel gauge was not working at all, it was not budging.  

I had to get towed in and parked it at the pier and it has not run since.  I tried today and it would turn over all day but not run.  It seems like it is not getting fuel for some reason.  I would not think that the new fuel pumps are stopped up, however when I took the two fuel lines off the top of the new fuel pump, they did not seem to be under any pressure like I thought they would be.  

I have a fuel pressure gauge that I used last summer after I installed the new pump and got good readings, but does that also work when your just trying to crank it or only when its running?  

Any suggestions?  This is really the first time I have run it hard since installing the new fuel pump.  When I ran it last summer it was just to make sure it would start back after cutting it off because that was the problem with the old one.  

Thanks!!

When you turn the key to Run, the pumps will run for 2 seconds or so and turn off if the engine isn't running.

So........as a starting point, hook the gauge up, turn the key to Run and you should hear the pumps run for 2 seconds and pressure should come up to the 39 + or - 3 mentioned earlier.    Post back with whatever results you have

Here's a link to last years thread with some good information to review. 

http://www.correctcraftfan.com/forum/forum_posts.asp?TID=50284&KW=&title=gt40-fcc-install-now-will-not-crank" rel="nofollow - link

Lee

I was hoping not to see a thread like this on your end, but I think you'll get thru it 

Start at the beginning, compression, spark, timing, fuel .Your slow cranking with a fully charged battery could be a bad connection or again, something wrong mechanically. I would turn it over with a deep 15/16 socket and long breaker bar to see if it turns smoothly, and go from there.

Ignition misfires can make the engine knock by firing cylinders at the wrong time.  Any chance there is moisture build up inside the distributor cap?