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fuel pump vent

R

Richmel

New member
on my 1988 Crusader 454, the fuel pump vent line fitting, and the fitting on the carburator has some kind of tar blocking each end of the vent. Is this normal, or should they both be clear?
 
Both should be clear. This is not a vent, rather a path for routing fuel to the carb should the pump's diaphram fail/leak. It's a safety feature that you should give top priority to and repair it.
 
That's to keep fuel from a ruptured diaphragm from leaking into the oil pan or bilge. The leak is routed through that clear hose (so you can see a leak) to the intake and burnt.

Jeff
 
Excessive fuel from a ruptured diaphram is to ideally kill the engine..... not be burned.
I suppose the severity of the rupture would play a role in this.

Ditto Jeff and Woodie..... get this working.


Replacing some items, such as a fuel pump, is never a bad idea.
If you suspect that the fuel pump is old, it may be time to replace it.
 
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If you've recently had to burn "Evil-Nol" gas, it removes crude that was happily resting on the bottom of your fuel tanks and sends it through the system."

Jeff
 
I like Jeff's "Evil-Nol" gas analogy! :D


rfdlou said:
Could the "some kind of tar" be the remains of a diaphragm ?
Click to expand...
makomark said:
i'd bet it is gum from the first ten years of use that finally got noticed.
Click to expand...

Questions/comments:
If the fuel pump diamphram has never ruptured or leaked......, where would any gum in this line or at the fittings have originated?
And if it had ruptured/leaked, how long could this have gone un-noticed?

Just a thought!

.
 
How did it get there - by way of the vapor rich source at the 'uphill end' of the sight tube. once inside the tube, it will sink as it cools (gasoline vapor is denser than air; both at the same temperature). I use to see this routinely, in the 80's, working on the non-outboard power plants in the shop.

How long....depends upon the size of the 'leak'. I'd suspect a pin hole on a lightly used engine couple go several years where a major failure would take in the range of "seconds" depending upon the operator and the engine's RPM.
 
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