Bringing a 40 Back to life-

[flash02]

If you have not purchased one you need to get a compete set of Factory Service Manuals (FSM), and the emissions guide for your truck. From the factory the engine was equipped with a mechanical fuel pump; this pump is a diaphragm pump that is actuated by a lobe on the cam shaft. As mentioned people will go the cheep rout and replace them with an electrical pump. The mechanical fuel pump is located on the front lower right hand side of the engine forward of the oil filter. As mentioned your year truck should be equipped with the electronic ignition distributor…not sure why someone would change it over to one using points. If you have not done so look through the FAQ section and get real familiar with your year truck.

Good Luck!

 

[sgtpeper]

Makes a bit more sense.

I did disconnect the fuel line from the carb and it is bone dry always.

My next step I suppose is to pour fuel down the carb and see if itll fire up that way at least.

I will take pictures of all the parts discussed so you guys can tell me whats what.

It would really help though if someone in CO would come take a look with me haha

 

[flash02]

Oh...nice 40, is your boss going to give it to you?

 

[sgtpeper]

Yep, hes giving it to me as my work truck. He offered to buy me a truck, but I remembered he had the 40 sitting in his driveway and I'd rathe drive something with character

 

[sgtpeper]

So if the fuel pump is driven by the cam, could the reason its not gettng fuel be the fuel filter is jammed??

 

[crotalusatrox]

how come my boss doesn't juss give me a rig like that,,, all I get is a free lunch every 2 weeks ...do you have any pics of your dad's '40,,,, mudders on this site luv vintage 40 pics!

 

[sgtpeper]

Hah no it was in the early 90s that he had one - and it was a 74 and was really just for fixing up to sell.

He DID however have a late 70s Cherokee Cheif 2 door for a winter car when I was a kid - with the 400+ CI engine, and big side pipes (which was how he bought it). Loved that monster haha.

 

[sgtpeper]

ANy of you guys use AIM and want to help me a bit that way? I'd really love to at least hear this thing fire today!!

 

[alkarich]

So sgtpeper, did you mean plugs instead of points?

Is there fuel in the line, tank side of the pump?

 

[Liam]

it really sounds like your fuel pump is not working.

 

[sgtpeper]

OK Super Bowl time and I just got back from working on the truck hehe.

Heres what I discovered and its all documented in photos for your viewing pleasure.

I am pretty positive the pump shown in the picture below is not a factory part. It is an electric fuel pump (I believe) it was bolted to a frame rail on the passengers side. A power wire ran along the frame into the engine and was taped - yes taped - into the harness that went to the ignition assembly - green plug? Either way when I disconnected it fuel came out of both ends. BUT the motor seems to be blown - as even when I directly connected it to the battery it would not make any noises so I am going to assume it is a dead unit.

The next photo I know is awful, but it shows another cylinder type device that was near where I removed the electric pump. It is not electric so I think its another filter? Is that correct? Should that be there???

The next photo just shows the mechanical pump is still in place and still hooked up.

The next one shows the fuel filter coming from the mechanical fuel pump in the engine bay - it seems in decent shape since I could blow through it.

SO what do I do next? New electric pump? Or new mechanical pump?? Whats correct on this thing and what isnt?!?!

Thanks guys!

 

[sgtpeper]

OH I should also add, I did put 3 gallons of gas in the tank. Since when I hit it with something metal it sounded oddly empty? Of course this didnt do anything - I did this before tracing the electric pump down.

BUT when I pour gas in the carb the truck does start and sounds great. It showed nice high oil pressure and after a few times of putting gas in the carb, the smoke went away and it actually sounded like it was idling nicely - even with black plugs and the top of the air cleaner off the car.

 

[alkarich]

So I think it has been determined that OEM is the mechanical pump.

Buy some rubber fuel line. Run it from the tank to the mechanical pump, from the mech pump to the carb and see what happens. Put a new filter in line as well to be on the safe side.

So when you say the mechanical is hooked up that is from the tank to the pump and then to the carb. All the lines were followed?

Photos #2 and #4 look like filters.

If the current stock mechanical pump doesn't work, buy a new mechanical one.

 

[alkarich]

Missed post #52 while I was typing! Great news!

So run some temporary fuel lines to the mechanical pump. Add the filter. See what happens.

You'll be driving it home soon.

 

[sgtpeper]

I pulled the electric fuel pump out and connected the lines that ran to the electric fuel pump and tried starting it with no success. There was gas running out of both sides of the lines sooo flow is there, but not enough pressure to pump it or so it seems.

Is the filter that seems to be off the tank supposed to be there?

Does anyone have a picture of the fuel lines and how they run?

Maybe I should just get a long length of fuel line and run it straight into the mechanical pump....

Is it possible they had both hooked up the entire time???

 

[alkarich]

How about that interception? 100 yards!

So back to the rig. I don't think the filter by the tank is original. But an additional filter can't hurt and shoudn't affect the flow.

Only one pump would/should have been hooked up.

 

[sgtpeper]

That interception was ridiculous!@

Interesting, but when I traced the metal fuel line from the front of the carb it still goes into the mechanical pump - so shouldnt that mean its still in place??

 

[alkarich]

So the carb line runs to the mech pump. Can the feed line to the pump be traced back to the tank?

 

[sgtpeper]

The feed line going to the mechanical pump?

Since the truck was running when parked, I would assume that that if the feed line for the carb goes to the mechanical pump, then the fuel lines to the mechanical pump must be coming from the tank correct??

 

[fj404life]

If you hook the line from the tank to the mech pump and disconnect the line at the carb and turn the motor over does fuel pump out the line at the carb end?