• Notice for iPhone users: DO NOT use the image size reduction option when uploading photos to the forum. This causes portrait images to post as landscape. We have added a warning to the image insert pop-up as well.

New to me 83 CJ8 Laredo!!

Well... it looks like the fuel pump is designed to run directly on the cam lobe, but it doesn't look like your cam has a fuel pump lobe on it!

Could your 258 have a 4.0 cam in it? I don't even know if that's possible. Maybe I'm just seeing it wrong. :shrug:

It should look like this:

fuel pump.gif
 
The diagram captures the basic principle of the thing. I don't think you can install the pump wrong. I had a lot of pump problems until I dropped and cleaned my tank. There doesn't appear to be anything missing from your old pump. Its just old and probably full of trash. Or bad diaphragm.

Bob
 
scramcraz said:
The diagram captures the basic principle of the thing. I don't think you can install the pump wrong. I had a lot of pump problems until I dropped and cleaned my tank. There doesn't appear to be anything missing from your old pump. Its just old and probably full of trash. Or bad diaphragm.

Bob
Click to expand...

I had this happen once before on a Scrambler I was working on, the one I posted a link to. I never thought about that happening, but you are correct, the fuel pump was completely impacted with crud :huh:
 
CJ7Pilot said:
Well... it looks like the fuel pump is designed to run directly on the cam lobe, but it doesn't look like your cam has a fuel pump lobe on it!

Could your 258 have a 4.0 cam in it? I don't even know if that's possible. Maybe I'm just seeing it wrong. :shrug:

It should look like this:

View attachment 70352
Click to expand...



You are right, it looks like the lobe the fuel pump arm is supposed to ride on is too far forward. Unless it is just the angle of the picture. I wouldn't think a cam could move that much, but maybe like you said, a 4.0 or aftermarket cam without the fuel pump eccentric???
 
spankrjs said:
You are right, it looks like the lobe the fuel pump arm is supposed to ride on is too far forward. Unless it is just the angle of the picture. I wouldn't think a cam could move that much, but maybe like you said, a 4.0 or aftermarket cam without the fuel pump eccentric???
Click to expand...

The lobe I see in the photo has a lifter sitting on it, so that's the angle of the photo. Right behind it (to the left in the photo) is where I would expect to see a nice shiny fuel pump eccentric lobe... but all I see is an unfinished part of the camshaft. Weird.
 
Here are pictures of my original 258, the cam is not original, it is a Clifford Cam.


This is fuel pump lobe.
20190227_103845.jpgresized.jpg

This is the lifter lobe to the right of the fuel pump lobe.
20190227_103851.jpgresized.jpg

This is the lifter lobe to the left of the fuel pump lobe.
20190227_103901.jpgresized.jpg
 
Believe it or not, I had to replace a fuel pump. I made the mistake of angling the pump arm up when installing the pump. The arm was riding on top of the cam. It felt tight when installing and I needed to use the bolts to bring the pump against the block. Tried starting and it wouldn't start (never realizing what I did). Pulled it apart and figured it out. I was lucky I didn't damage the cam lobe. Put the pump in the correct way and it ran fine. My first build when I was 20. I felt like a idiot then and now. Maybe the previous owner did the same thing, didn't figure it out and went the electric pump root?
 
Second thought it looks like he's missing the lobe. It looks like it was riding on the shaft. Could someone have changed the cam to one that is made for a electric pump.
 
This is the strange wiring with replacement ignition module
 

Attachments

  • 9E957163-CE6F-4EB5-8F07-3C84573D607B.jpeg
    9E957163-CE6F-4EB5-8F07-3C84573D607B.jpeg
    113.1 KB · Views: 19
  • B87BE4D4-F8B0-4DCB-B5E9-53F82BF0E4F6.jpeg
    B87BE4D4-F8B0-4DCB-B5E9-53F82BF0E4F6.jpeg
    87.1 KB · Views: 19
  • 9644081D-6A30-42A7-A59A-68102DA2039B.jpeg
    9644081D-6A30-42A7-A59A-68102DA2039B.jpeg
    113.3 KB · Views: 19
Not sure but they did put in an electric pump.
 

Attachments

  • 9EA36373-1FE0-4E3E-A103-58C09549E6D8.jpeg
    9EA36373-1FE0-4E3E-A103-58C09549E6D8.jpeg
    139 KB · Views: 27
The pump is in the wrong place. Electric fuel pumps are pushers, not pullers. It should be as close to the tank (or in the tank) as you can get. Nice fuel line. What a mess.
 
bryrambler said:
Not sure but they did put in an electric pump.
Click to expand...

Wow, just wow!

Clear vinyl tubing mounted over top the starter solenoid! Get that fixed before you burn it to the ground.
 
bryrambler said:
This is the strange wiring with replacement ignition module
Click to expand...

This is the stock type ignition module. At least you still have the factory plugs on the distributor side, I just had space connectors.
 
Ok.. better pics of fuel pump opening.
 

Attachments

  • F0A7AB5D-75C1-4D42-9BB4-F423CF8B0771.jpeg
    F0A7AB5D-75C1-4D42-9BB4-F423CF8B0771.jpeg
    200.8 KB · Views: 15
  • 365ABD5C-A230-4E28-968E-3EA566078B0B.jpeg
    365ABD5C-A230-4E28-968E-3EA566078B0B.jpeg
    156 KB · Views: 14
  • 4962B49A-B692-44BF-9E80-C8AF09C85F22.jpeg
    4962B49A-B692-44BF-9E80-C8AF09C85F22.jpeg
    163.7 KB · Views: 14
Well, I don't think anything fell in to your oil pan... I think it's pretty evident that someone installed the wrong cam! :shrug:

No sweat though, it's not that big of a deal to keep running an electric pump for a while.

Heck, you might decide to install fuel injection, and the mechanical pump would end up being useless anyway!

You can get a plate to cover that hole, and leave the fuel pump off. That might help avoid confusion for someone in the future.

Have fun! :cheers:

Edit: Like ag4ever mentioned, it would be a good idea to relocate that electric fuel pump. :wave:
 
Wow! Crazy! Yeah the electric pump works. It just needs clean gas to pump. And I do want to install fuel injection! I wanna research a bit but I was thinking of going that rout. But until then where should the pump be put along the line... I think he mentioned closer to the tank..?
 
You must log in or register to reply here.
Back
Top