SOLVED: What did I mess up? (Fuel pump rebuild, won’t start) (1 Viewer)

[sleepycruiser]

I rebuilt the fuel pump on my ‘64. Pretty straightforward. I also installed the glass bowl filter where it is supposed to go. Buttoned it all up. Started and ran for about 10 seconds. Now it won’t start. No gas on the glass filter housing…so I am assuming it lost prime. Should I pour gas into the line going back to the fuel filter to see if I can get it filled?? I pushed the gas pedal 5-6 times before cranking as that is normal to get it started. Thoughts?

 

[sleepycruiser]

Filled the glass filter housing with gas…made sure the hole in the filter was up (wasn’t sure if that made a difference) and still won’t start.

Put a tad of gas in the carb…starts up and then dies immediately

 

[Jdc1]

Filled the glass filter housing with gas…made sure the hole in the filter was up (wasn’t sure if that made a difference) and still won’t start.

Put a tad of gas in the carb…starts up and then dies immediately

smutz in the intake screen of the carb?

 

[sleepycruiser]

smutz in the intake screen of the carb?

It was running fine before…and I have a filter right before the carb.

 

[sleepycruiser]

When the pump goes back on the block does the arm/lever need to go above/below anything? I just bolted it back. The manual didn’t say to do anything special.

Kept it going by spraying carb cleaner for about a minute. No fuel pressure. Hmmm.

It also seems like gas is comping out of the pump weep holes, but not a lot…enough to feel and make my hand wet.

 

[sleepycruiser]

Any ideas from the Monday crowd?? I plan on taking the top of the pump off today to see if fuel is in there, but there is gas in the filter between the pump and tank…so no reason it shouldn’t be getting to the pump.

 

[timmyisinthewell]

Disconnect your fuel line to the carburetor and run it into some type of container to capture your fuel and then crank the engine over briefly to see if you're pushing any gas.

 

[rkymtnflyfisher]

Did you make sure the cap was aligned probably on the fuel pump body? If it's off it won't create two distinct chambers.

 

[sleepycruiser]

Did you make sure the cap was aligned probably on the fuel pump body? If it's off it won't create two distinct chambers.

I did, but I will make 1000% sure this evening. I took before/after pics and it is clocked the same.

 

[rkymtnflyfisher]

I did, but I will make 1000% sure this evening. I took before/after pics and it is clocked the same.

I made that mistake myself, had the same symptoms.

 

[charliemeyer007]

$10 electric fuel pump on Amoron.

 

[Shark56]

If you are getting gas weeping out of the pump make sure you check your oil for gas intrusion through the pump arm into the oil pan.

 

[dazerb]

Okay. Not sure if this will hit your issue... I have a poly tank from PO. 74 with return lines capped and desmogged.
The best advice i got was to blow BACK through line into tank.
Poly tank can collapse just enough to compress pickup tube if run low on gas. That can cook the mech pump.
I am planning on replacing tank with OEM when i can.
The OE mech pump seems uncapable of pulling from tank if you have air all the way back. IE if i run fully out of gas (ask me how i know)
Killed battery cranking.
I carry an extra mech pump AND CHEAP electric.
I use the 12v pump inline until gas is pulled FROM tank and mech can take over.
I actually left the 12v pump inline for now. Pulls through no problem.
I also have a fuel reg and Weber 38

 

[Mark W]

For starters, your fuel pump does not need to be primed.

The pump can only go on one way, nothing to do wrong there.

You should not see ANY indications of fuel or oil from the weep holes.

Not sure what your problems/symptoms were before the rebuild, but make sure that the line from the tank is clear. Blow backwards through it and listen for bubbling from the tank (at the gas cap).

The problem, unfortunately, is probably with the rebuild.

Check for obvious gasoline smell in the oil/raised oil levels. You can get, and you DO NOT want to get, fuel leaking from the pump into the oil pan.

Mark...

 

[sleepycruiser]

For starters, your fuel pump does not need to be primed.

The pump can only go on one way, nothing to do wrong there.

You should not see ANY indications of fuel or oil from the weep holes.

Not sure what your problems/symptoms were before the rebuild, but make sure that the line from the tank is clear. Blow backwards through it and listen for bubbling from the tank (at the gas cap).

The problem, unfortunately, is probably with the rebuild.

Check for obvious gasoline smell in the oil/raised oil levels. You can get, and you DO NOT want to get, fuel leaking from the pump into the oil pan.

Mark...

Well, it ran before the rebuild so definitely something going on. Oops!

I’ll try blowing backwards into the tank, but I drive it into my garage just before doing the rebuild. I plan on doing an oil change regardless once I get this figured out ‘just in case’.

I was hoping it was a prime issue…but sounds like that might not be the case if the pump doesn’t need to be primed.

 

[sleepycruiser]

I took everything apart except the fuel pump. Took the glass bowl filter off…it is new. No issues…hole pointing up on the filter to allow gas to go through. I blew into the hose towards the tank to make sure nothing was stopping up. Blew all the lines on each side of the pump. Still nothing. Filled the pump with gas by taking the top plate off. Nada.

So I think it has to be the fuel pump. What doesn’t make sense is that there is only one way to put it back together…

If I put gas in the carb it starts..and if I press the gas pedal it Reva and then dies. No gas making it through the pump…as I have another filter between the pump and carb.

 

[Pighead]

Could just be the needle valve is stuck closed...

 

[sleepycruiser]

Could just be the needle valve is stuck closed...

Where is that??

 

[charliemeyer007]

Sounds to like me there is a vacuum leak in the fuel pump diaphram - seating issue when you screw it back together something tweeks it a little.

needle valve is what the float in the carb pushes on to shut off the flow when the bowl is full.

 

[sleepycruiser]

Sounds to like me there is a vacuum leak in the fuel pump diaphram - seating issue when you screw it back together something tweeks it a little.

needle valve is what the float in the carb pushes on to shut off the flow when the bowl is full.

Well it was running yesterday morning so I’m inclined to think it is the pump.