View Full Version : Advice/Help
03-21-2007, 03:20 PM
Ok, here is the story.
I just got my '72 SII back from getting the engine rebuilt. Well for the first few days it was running well but it kept running out of gas at inopportune moments. Well i finally decided that it was the fuel pump, as the fuel filter was not filling up enought to get fuel to the carb, and it had been sitting dry for a couple of years. So i replaced the fuel pump and changed the oil, but now it will only crank over but not fire up!? I am afraid that some internals may have been damaged by the gas in the crankcase. Does anyone have any experience with anything like this or can offer any advice??? I would appreciate it as i am pretty fed up. Any way this is the reason that I missed the run on the 17th, sorry i wasn't there it sounded like it was going to be fun.
03-21-2007, 03:49 PM
It sounds like fuel was running through a busted diaphragm in the pump to the crankcase. Is that what you are saying?
Can you verify that you are getting fuel to and through the pump to the carb?
Checked for spark? If it had been setting for a few years you may have ended up with debris in the carb.
03-21-2007, 04:11 PM
ditto, did you buy your pump from O'Reilys,Napa,or advanced auto/autozone?
I only trust Napa or O'Reilys for rebuilt or new parts. I have been through 3 "new" autozone fuel pumps to one Napa. just my $.02
I would check for a spark at the plugs first. If you get a spark check for gas in the carb. You can always use starter fluid as a check. fuel and spark it should kick over with combustion.
03-21-2007, 04:46 PM
Well the carb is fresh and the new pump is from Napa, but what i am worried about is gas passing through the diaphram.
03-21-2007, 06:35 PM
When you changed the oil, did it have any metal in it. This may or may not tell you if any damage occurred because you say the engine is a fresh rebuild, I would think a little metal would be expected anyway.
I would verify a fuel issue by pouring a small amount down throat of carb or like JJ suggested, just a little starting fluid. If it fires, fuel issue. If it is a fuel issue, a carb rebuild may be in order. I would also, add a fuel filter before the pump, and maybe clean out the tank. Has the tank been out of the truck recently?
Just my advice.
As far as gas passing through the pump to crank case. Did the engine overheat when it quit running, did it start making weird noises? Why are you worried about damage other than the fact your oil was thinned out, which is nothing to take lightly, just wondering if there was anything else that has you believing this is the case.
You didn't say, have you verified spark yet? This is the simplest and quickest thing to check. :)
03-22-2007, 10:47 AM
The engine did not overheat, but started making a soft consistent grinding noise sort of a "whir". Any way, the tank is a new poly unit, but i have not verified spark since the ignition system was in working order when this problem arose. I will however check for spark before I post again.
03-28-2007, 05:05 PM
Ok here is the current situation,
Verified spark, but also discovered the carb is not getting gas. I blew out the lines, put in a new filter- no luck. Did I get a bad pump???? The only difference between the old pump I pulled out and the new pump I put in is the shape of the arm. The old one was just a hair shorter and had more bends in it compared to the straighter (relatively) armed new pump. I took this up with a Napa counter jockey but they told me that the part number crossed and also it looks like the arms will still engage the cam in the same spot. So I went ahead and installed it, now it does not work. IS there anything obvious that I am missing????????? I looked at two different parts stores ( Vans S. lamar in Austin and Napa in San Marcos) and neither had a pump that exactly matched the old one. Damn
03-28-2007, 05:45 PM
Get a seperate fuel container. Stick a hose in it and put that hose on the inlet side of the pump.
Remove the line from the carb, Crank the engine.
Are you getting gas now?
If so it could be a bad fuel line(cracked or a hole and it is sucking air) or it could be a clog on the pickup tube in the tank
If you still have no fuel using the seperate fuel container then it is a pump issue(Either a bad one or the wrong one)
Was there gas in your oil??
When you drained the oil out was there a lot more(Quanity) than there should be?
Pumps don't always dump fuel into the crank case when they go bad.
Let us know what you have tried
03-29-2007, 01:45 PM
I did the whole song and dance with the seperate gas can, and I checked the lines immediate to the pump and carburator. I would like to know if it is the different arm on the pump that is causing the problem because the second style is all I have been able to find from the parts stores, so replacing this one with the same would be a waste of time. I might just go to an electric pump but as always $$ is a factor.
Bob has a few extra fuel pumps laying around his yard. Try PMing him to ask for one. During the clean up I saw maybe ten or so, all different types. One was new still in a box.
03-29-2007, 05:15 PM
had the same problem, THE ARM ON THE PUMP DOES MAKE A DIFFERENCE
04-03-2007, 09:04 PM
Finally some good news.
I have tracked down what seems to be the right pump with the right arm. It will be waiting for me at carquest tomorrow morning. Too bad I have a whole pants load of school work to do this week, I will probably dive into the scout anyway. Why arent I graduating this may ;) I want to drive it to Bobs so someone can help me install the DUI that has been sitting in my closet for too long, and so I can really check out everyone else's rigs. Wish me luck, I'll need it.
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