vacuum leak
Posted: Wed Mar 11, 2015 2:58 pm
My recently purchased M38A1 runs a little rough and my mechanic friend seems to think we may have a vacuum leak. It has a fording kit stack. When he holds hand over intake, the rpms increase which he says usually indicates a vacuum leak.
There is supposed to be a vent line from the air intake hose to the distributor that is missing but it would appear this is to give free air to the distributor when fording. There is also a short vent pipe from the top of carb to the side of the air intake hose. This was missing but has been put in place without changing anything.
The valve off the side of the fuel pump is there but open at the end There is no vacuum lines set up for wipers and the fitting for this line that feed around to the distributor is capped.
Any suggestions as where the look? The seller of the jeep has done an extensive job of new tub, tank, tires, wiring harness, canvass etc and says the carb was rebuilt so I would think at least the diaphragm, etc are all fresh.
Thanks for helping a newbie
Mikeabn
There is supposed to be a vent line from the air intake hose to the distributor that is missing but it would appear this is to give free air to the distributor when fording. There is also a short vent pipe from the top of carb to the side of the air intake hose. This was missing but has been put in place without changing anything.
The valve off the side of the fuel pump is there but open at the end There is no vacuum lines set up for wipers and the fitting for this line that feed around to the distributor is capped.
Any suggestions as where the look? The seller of the jeep has done an extensive job of new tub, tank, tires, wiring harness, canvass etc and says the carb was rebuilt so I would think at least the diaphragm, etc are all fresh.
Thanks for helping a newbie
Mikeabn