This is kind of a continuation of another thread, but the problem was solved in the last thread and it morphed into this now. I'm making a new thread with a relevant title to the new issue.




Mark, assuming that is your truck as your avatar, you should have an electric fuel pump (to my understanding) to supply the higher pressure for EFI. With this said, we have a setup that's quite a bit different.

I have a mechanical fuel pump that is mounted to the front PS side of the 20r head. So no electronics from my understanding unless There something else I'm missing. There is fuel in the the tank as it was never drained and it's been sitting there for a few months. Probably drove it a month and a half ago or maybe two.

I'm going to trace the fuel line back to the filter and see if it's stopped there. The filter is new, but it may be that it got gummed up there from sitting so long. I'm gonna see if the fuel is on either side. If not then I'll go back to the tank and check it out there. If fuel is flowing well from the tank then I think I can safely say it is the pump, but then again I can't imagine it would be the pump b/c it was on the last rig and ran just fine. I think I have another pump though.

Wait.... this just came to mind. Do you have to "prime" (term used loosely) the mech fuel pump so it has pulling power or does it create enough vacuum to pull an empty (just air in the lines) line from the gas tank? I cranked the engine quite a bit and nothing got there, so this could be the problem. Any thought on this? I think it could be a good possibility of the problem as fuel shouldn't turn bad over a couple months, but not impossible.

 

the fuel pump has enough to create it's own vacuum to pull the fuel up by itself. It does take a little bit for the fuel to get there though. Of course this assumes the fuel pump is in fact good.

make sure you don't have the fuel lines mixed up and the pump isn't pulling through the return line instead. or the outlet of the pump is hooked to the fuel return and the return on the pump isn't hooked up to the carb. I think you know what I mean.

 

I've got the inlet on the pump (it's labeled) to the hard pipe/hose from down by the clutch cylinder. then I've got the out going to the carb. I'll grab a photo or two, but I would be blown away if there was something wrong with the way it was hooked up. I have cut out the return line as this has been suggested by many people with a weber carb setup. I'll tight all the clamps even more, maybe I've got a vacuum leak in there that's not allowing the fuel to get there. If all fails, I can switch the pumps. I'm pretty sure I have another.

Just curious, in all the cranking, does the engine get proper lubrication? I would assume so since it is all mechanically driven.

 

yeah your fine on the cranking part. as long as the crank is turning so is the oil pump. Fuel lines sound right at least on the chassis side.

 

Sweet. That's what I thought. I'm pretty stoked to get this thing up and running. It's been down forever. I'll post up once I get more info to post up on it.

 

Tried priming the engine with some gas down the throat of the carb to get it started, and maybe itll get enough vacuum to suck gas in?

 

yeah, I may have to do that. Never done it though. How much gas should be put in there? Just roughly.

 

just a little ...

 

Like slacker said, not that much.
A splash or two. And repeat if it doesn't start

 

Thanks. I'll have free time tomorrow to do it for sure.

 

I went and got some fuel today and put it in the truck. Sure enough there was a small fuel leak down by the fuel filter. That's why there's not fuel. Fuel has been traced all the way up to where the inlet of the carb it. Fuel issue solved. I was certain it has fuel, but guess I was wrong.