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.

 

[dagomike]

Check the fuel lines from the tank to the fuel pump. I once accidently partially crushed a fuel line when jacking my car up and down and it created a fuel starved situation. I had to take it to a shop and once up on a lift and inspecting it was detected. Cut out the crushed line and temporarily put in a rubber hose and she fired right up and ran like a champ. Good luck.

 

[Mopar Nut]

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.

Don’t give up, stand back and give it a rest for awhile. You sound like me back when I was working on my Challenger back in the 70s. It’s a 318 that wouldn’t start, I popped the distributor cap, the rotor wasn’t turning. It was a nylon gear on the distributor that snapped off. Post some pictures of your car.

 

[Fordication]

Here is my car.

 

[rallye340]

Beautiful car.

You won't get a steady stream out of the pump unless the engine is running which is very hard to see or test. What you're describing sounds normal to me.

What is the problem you're experiencing? There's lots a very knowledgeable people on this site that can steer you in the right direction if only you described a symptom or symptoms.

 

[Fordication]

Beautiful car.

You won't get a steady stream out of the pump unless the engine is running which is very hard to see or test. What you're describing sounds normal to me.

What is the problem you're experiencing? There's lots a very knowledgeable people on this site that can steer you in the right direction if only you described a symptom or symptoms.

Thanks. I replaced the pump already and its still doing the same as before. That was a waste of money. So now working on the EIM and then the coil. Which did not show 12 volts on the pos bolt.

 

[Mopar Nut]

Nice looking Challenger.

If it is the timing chain, it’s not too bad to replace. You have nice weather, so it wouldn’t be too bad. Make sure to take plenty of pictures of where everything goes and the alignment.

I’ve seen this happen, double check your fuel filter is not installed backwards.

 

[mrmopar340]

Here is my car.

View attachment 152207

View attachment 152208

View attachment 152209

I think it's long lost cousin wants to wave at you. Took me 2 decades to be where I'm at now.

 

[Fordication]

I think it's long lost cousin wants to wave at you. Took me 2 decades to be where I'm at now.

View attachment 152213

Beautiful car. I was thinking of going that route then I decided it's probably best to build a sleeper. Maybe add some relish with being original with chrome but build a small block monster that has a great suspension and drives well.