Crank No Start

[dzolalaw]

Hello,

Trying to diagnose a crank/no-start issue. Starting with fuel. When I turn the key the fuel pump makes the prime noise and fuel pressure goes up to about 20 (just prime no crank) but then rapidly goes down to zero. I Pulled the fuel delivery line off after the fuel filter, getting fuel. Pulled the fuel delivery line (after where the autometer gauge mounts to the line), getting fuel. I’m trying to figure out if the drop in fuel pressure after prime is the reason for the no start. If so, what can the issue be? The inertia switch works, I popped it and got no fuel pressure whatsoever then reset and got the fuel pressure as described above.

I am going to try to attach the video of what it is doing.

Any help would be greatly appreciated.

Daniel

 

[broncojunkie]

Did you try giving it a shot of starting fluid right down the intake? 20 psi does sound low. I believe it needs about 30 psi to run. If it fires off with a shot of starting fluid, it is a fuel issue. Check that the injectors are firing. If they appear to be working, then I would drop the tank. Look at the pump and pickup filter and see if it has crud sucked into it. You may find a bunch of rust and junk in the tank. If so, then you'll probably need a new tank and pump. Both are fairly inexpensive.

If it doesn't start with starting fluid, then start checking for spark issues. Ignition switch, distributor (magnetic pickup), Ignition coil, etc. Also remove distributor cap and make sure the rotor is turning.

Just a few things to start off with. Good luck!

 

[dzolalaw]

I went ahead and ordered a new aeromotive pump. Waiting for its arrival. The tank is brand new, pickup filter wasn’t clogged at all. I figured for the price I may as well just replace the pump and hanger bracket. They were inexpensive relative to the amount of work I would have had to do to reinstall, raise the tank back up only to find out the pump, while working, simply wasn’t giving me the pressure I needed. As others mentioned, the rubber fuel line from the pump to the hanger was inspected and upon closer look and a set up I rigged that allowed me to watch the pump run, I did find a small leak. Not sure if it was enough to cause the quick and steady drop in fuel pressure I was seeing but at least now I will know everything is brand new and if I continue to have the problem I will have to start looking in other places. Once I get the car to hold the fuel pressure, I can move on to spark. Hopefully, this solves the problem. If fuel pressure holds but still no start condition then I will have to continue down the checklist. Thank you for taking the time to reply!