Mechanical Fuel Pump

[Fordication]

Ok so I tested my pump and it is not a steady flow. As a matter of fact it pumps fuel about every 3 seconds as my wife turns it over. Like on off off off on off off off. Not a steady stream until it pumps but it pumps and the motor turns over for a few secs than it pumps. So its a pulse but to me it seems like that's not right and I cannot find a video anywhere on the internet showing the flow out gas. Like FM there is no gd video anywhere.

 

[pschlosser]

the mechanical pump squirts in spurts, like the way blood spurts out in a horror movie, when someone gets their jugular vein cut. as I said in the other post, the FSM says it should pump about 1 quart of fuel in about 1 minute of cranking.

 

[Fordication]

the mechanical pump squirts in spurts, like the way blood spurts out in a horror movie, when someone gets their jugular vein cut. as I said in the other post, the FSM says it should pump about 1 quart of fuel in about 1 minute of cranking.

I am done. New carb. New hoses, new fuel pump, new filters. That leaves the timing gear. I do not have the time to deal with this BS.

 

[Chryco Psycho]

What engine is it ?
Big blocks use a pushrod that can wear down causing reduced or minimal flow , small blocks use a cam bolted to the front of the camshaft the pump should push fuel with every second crank rotation or 1 full rotation of the cam would be a full cycle of the pump so if the engine is cranking normally it should be every second approx .

 

[540HemiCuda]

Our big blocks are famous/infamous for the fuel pump push rod wearing down to the point that the pump stroke is severely compromised. Been a problem since the 70s. Pull the rod out and you will be able to tell if the cam end is worn. First off, it may be difficult to get out because the cam end is flaired out. The cam usually isn't hurt, so you can just install a new pump rod.

The pump should squirt every other rotation of the crank since it is driven off a concentric on the cam.
.

 

[Fordication]

What engine is it ?
Big blocks use a pushrod that can wear down causing reduced or minimal flow , small blocks use a cam bolted to the front of the camshaft the pump should push fuel with every second crank rotation or 1 full rotation of the cam would be a full cycle of the pump so if the engine is cranking normally it should be every second approx .

Just a 318. No pushrod and it does not come out every rotation

 

[Daves69]

............That leaves the timing gear............

Guessing you've already checked to make sure the fuel feed to the pump is adequate.
It does seem unlikely two different pump arms aren't riding the eccentric.

 

[Katfish]

Check all the rubber lines from tank to pump.
I had similar issue and it turned out to be a pin hole in the rubber line.
Pump couldn't get suction.

 

[Fordication]

Check all the rubber lines from tank to pump.
I had similar issue and it turned out to be a pin hole in the rubber line.
Pump couldn't get suction.

I drove the car all the way from Wisconsin to Houston non stop. Not a problem until the next morning.