jsosh26.....76LandCruiser...SHUSH......

[jsosh26]

Nice work. What did you use other than the gasket?

I put permatex around the very edge of the gasket...actually put it on the opening to the engine and let it get tacky, then put the gasket with screws and pump on. they make a special sealer that is for soft gaskets that they have at any parts store.

I talked to a few guys on here and at the parts store that said that would assist, along with tight screws in avoiding leaks. Did you put anything on yours when you redid it?

Weird thing is the mech pump that came off didn't seem to have any gasket....just some black rubbery glue.....maybe that was a gasket (a thinner one) and it deteriorated....who knows....will get back to hooking up the battery and putting fuel in her after Christmas....family arriving in a few hours...Merry Christmas...and thanks for the advice.

oh and I feel vindicated as 2 guys have pm'd me after seeing my documentation of the heater bypass thread over in the 40 tech section. so I am glad I put that info. out there....thanks for your input on that as well.

 

[77TLCFJ40]

Did you put anything on yours when you redid it?

oh and I feel vindicated as 2 guys have pm'd me after seeing my documentation of the heater bypass thread over in the 40 tech section. so I am glad I put that info. out there....thanks for your input on that as well.

I don't think we used anything other than the dry gasket. That's why I got another gasket to re-do it later. We were not able to scrape all the old sealant/gasket off the block, so I knew it was a trail fix that would need to be redone. It has held for ~3 years, but I can't tell the difference in oil leaking from the oil pan gasket or fuel around the pump!?! It'll all get done before summer.

There are always other new 40s owners with similar issues. If you can't find what you're looking for with a simple search, then they probably can't either. Good tech is good tech at all levels. Be sure to name your threads appropriately so they are easy to search for in the future. Nice work. I like your tech posts better than the "others".

Merry Christmas

 

[AndyO78FJ40]

Nice work John. You may want to roll it out into the driveway to start it up the first time.

 

[jsosh26]

Nice work John. You may want to roll it out into the driveway to start it up the first time.

did this......... not so much

Ok help me out guys.......

1. I put about a gallon in the tank and checked for leaks...no issues
2. turned it over and checked the battery meter, connections, wiring I had done.....no sparks....hooray
3. got out the fire extinguisher and put the key in the ignition, turned it over......nothing..I mean it's turning over but it's like there is no fuel getting to the pump.

so....do I need to remove my line just shy of the pump and put some gas in there ...trying to ensure it's not just dry lines? or do I need to try the choke (which I don't have) Trying to trouble shoot the mech pump which creates a vacuum with the rubber gasket inside and sucks fuel down the line, but I am a little lost on how this works if it's the first time.

any ideas.......the turning over the first time was great in theory but didn't work so hot in practice

 

[jsosh26]

There are always other new 40s owners with similar issues. If you can't find what you're looking for with a simple search, then they probably can't either. Good tech is good tech at all levels. Be sure to name your threads appropriately so they are easy to search for in the future. Nice work. I like your tech posts better than the "others".

Merry Christmas

yeah I figured...I titled it something dummy proof like help with rear heater bypass.

I enjoyed this post's feedback better than the others too!

 

[77TLCFJ40]

did this......... not so much

Ok help me out guys.......

1. I put about a gallon in the tank and checked for leaks...no issues
2. turned it over and checked the battery meter, connections, wiring I had done.....no sparks....hooray
3. got out the fire extinguisher and put the key in the ignition, turned it over......nothing..I mean it's turning over but it's like there is no fuel getting to the pump.

so....do I need to remove my line just shy of the pump and put some gas in there ...trying to ensure it's not just dry lines? or do I need to try the choke (which I don't have) Trying to trouble shoot the mech pump which creates a vacuum with the rubber gasket inside and sucks fuel down the line, but I am a little lost on how this works if it's the first time.

any ideas.......the turning over the first time was great in theory but didn't work so hot in practice

It will take a long time for fuel to reach the carb. Stay on it. Check for leaks and kinks in the lines too. Do you have a plastic fuel filter so you can see the fuel moving inside?

 

[jsosh26]

It will take a long time for fuel to reach the carb. Stay on it. Check for leaks and kinks in the lines too. Do you have a plastic fuel filter so you can see the fuel moving inside?

so I put some gas directly in the carb and of course it cranked, but the pump is still not pulling fuel from the tank....I continue to investigate....hoses/lines look ok, no leaks.....I am PRAYING the pump won't have to come back off....it's a yes/no on being lined up as the 2 screws go in or they don't....mine is snug against the block so I have to think the issue is somewhere bn the tank and pump.....about to go break some line and check.....any other ideas/options are appreciated.


lines look ok....the weber has an electric choke (i realized this after reading some threads) so that is why the choke cable is tied to the firewall.....yet ANOTHER hose/wire to no where mystery solved....that makes 4!

 

[Bodean]

There should be power to the choke. If I was home I could look and see where my power is coming from for ya. Prime the carb and crank it that way. Maybe it will start pulling fuel. Keep us posted.

 

[jsosh26]

broke the fuel line where it runs into the fuel pump and it was DRY.....the lines are the same ones that were running the electric pump so I can't figure out why the fuel is not falling from the tank down below and then along the frame rail. (fuel sending unit...I know nothing about them)...I opened the fuel door and the tank hissed so it's sealed off properly and creating a vacuum......last thing I can check is to break the fuel line along 2 spots on the frame rail...the most likely culprit is the connection coming off the frame (metal tubing) to a rubber hose that goes almost vertical for a foot and then bends towards the battery box and curves to the pump....but had to help with my daughter so.....waiting til tomorrow.

 

[Bossman]

Try blowing through the line and back into the tank. You should be able to hear bubbles in the tank when you do this. You could have some rust/debris blocking the pick-up.

 

[Bodean]

Add more gas. A gallon might not be enough to get ya going.

 

[jsosh26]

Frustration continues

Try blowing through the line and back into the tank. You should be able to hear bubbles in the tank when you do this. You could have some rust/debris blocking the pick-up.

It's a new tank, but I will try it and see what happens

Add more gas. A gallon might not be enough to get ya going.

I have almost a 1/4 tank in it and poured almost a 3 ounces into the carb to get her going..

Thanks for the ideas ill blow in the line first and if I hear bubbles try putting more fuel in it....stay tuned

 

[77TLCFJ40]

What part inside the motor mechanically engages the OEM fuel pump? Is yours in good working order?

 

[jsosh26]

What part inside the motor mechanically engages the OEM fuel pump? Is yours in good working order?

The cam engages the arm of the pump which pushes against a spring, which "squishes" the diaphram creating vacuum to pull fuel down the line from the tank.........That is my understanding.....this sounds like it was a test....and yes I had thought of this, but would rather figure out why no fuel is coming down the line before I go back into taking the fuel pump off....if removed can I see the cam? Remember I did mine lying below so I didn't even think to look.

I FEAR that the cam may have issues and that is why they went to an electric.....oh dear God....what have I done!! Should I continue to trouble shoot why the fuel isn't getting down the line from the tank and then, nif I need to remove the pump, do it to check the cam?

 

[jsosh26]

how a mech fuel pump works

Fuel Pump Operation
The camshaft has an eccentric that is designed to operate the pump's lever arm. The arm's fulcrum point is very close to the part that actuates the diaphragm, so very little movement of the arm at the camshaft results in significant movement of the diaphragm. Each 360-degree rotation of the camshaft results in one complete cycle of the diaphragm itself.

As the diaphragm is pushed up, gasoline above it is pressurized and moved out of the pump and into the fuel line to the carburetor. The pressure of the fuel is typically designed to be 2-6 psi, depending upon the manufacturer. As the lever arm allows the diaphragm to return to its rest position, one-way valves in the pump body prevent the return of fuel from the carburetor and open a path for fuel to be drawn from the gas tank. The vacuum created by the diaphragm's movement draws fuel into the chamber, helped by the siphon already present in the fuel system.


located at How A Fuel Pump Works

 

[77TLCFJ40]

That wasn't a test, but it sure was a good answer. Thanks for the thorough edumacation.
I hope your cam is OK. Keep workin. You'll figure it out soon.
Did you already mention a chat with the PO or PPO was not possible?

 

[euclid]

Here's some other tips for debug of fuel supply.

Take Daryl's suggestion of blowing on the fuel supply a step further. Break each portion of line that you can isolate and test it from one end to another by blowing on it. Work from one end to the other. If you find that each section is clear, then you have eliminated line blockage as an issue.

Break the line upstream of the pump. When cranking the over you should feel some pressure coming out of that line, if not fuel. It can take a good bit of cranking to pull fuel all the way up the line, like Lash said.

Don't let Lash's concerns about the cam freak you out... very unlikely that's the issue.

 

[jsosh26]

That wasn't a test, but it sure was a good answer. Thanks for the thorough edumacation.
I hope your cam is OK. Keep workin. You'll figure it out soon.
Did you already mention a chat with the PO or PPO was not possible?

PMd PO PPO I have never talked to but PO did the elec pump swap so hoping he can shed light.

 

[jsosh26]

Here's some other tips for debug of fuel supply.

Take Daryl's suggestion of blowing on the fuel supply a step further. Break each portion of line that you can isolate and test it from one end to another by blowing on it. Work from one end to the other. If you find that each section is clear, then you have eliminated line blockage as an issue.

Break the line upstream of the pump. When cranking the over you should feel some pressure coming out of that line, if not fuel. It can take a good bit of cranking to pull fuel all the way up the line, like Lash said.

Don't let Lash's concerns about the cam freak you out... very unlikely that's the issue.

going to get to blowing all the lines today (no jokes about all my hot air typing) between the Christmas decoration break down...will see if I find anything and post up.

If I can't figure it out....how's about Friday or tomorrow, whatever works for yall anybody interested can come collectively scratch heads with me....any interest in attending a newbie wrench session post up here....thanks for the encouragement

 

[jsosh26]

Lost in the sauce

It can take a good bit of cranking to pull fuel all the way up the line, like Lash said.

QUOTE]

how much cranking? I have cranked the engine, using the fuel into the carb bypass route and it cranked and ran for 20 seconds. When I give it gas I get a little smoke from the exhaust and then it dies (probably cause the fuel was gone). I also hear a hiss from the top of the carb...Im guessing this is the pressure releasing as the fuel is gone from holding it in?

Upon further inspection I have fuel all the way up to the last 2 feet of hose BEFORE the pump....this 2 feet is on an incline the entire way.(rubber hose from inside frame rail to factory pump position)...the hoses on the exit side (to the carb) look clear and are metal that were used on the truck before this debacle started so I know they are good too.

My concern is that the pump isn't getting vacuum for some reason.....or does it just literally take 30 minutes of turning her over to get the vacuum on....shouldn't the carb firing the pistons create enough of a vacuum to start pulling it?