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Progress Thread 1989 LX 5.0 convertible - mild project

  • Thread starter Thread starter Scott_S
  • Start date Start date Aug 18, 2025
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Scott_S

Active Member
Jan 16, 2022
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Rock Hill, SC
Sep 14, 2025
#61
  • Sep 14, 2025
  • #61
The leak seems to have stopped after i drove it around a little more.
Anything I should be aware of, though? Other than "Don't over fill it".
 

General karthief

wonder how much it would cost to ship you a pair
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polk county florida
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#62
  • Sep 14, 2025
  • #62
I'd say the pump/sending unit is leaking at the O ring on top.
If the tank has not been pulled I'd use up the gas as much as I can, in the mean time get a couple O rings for the pump/sender hanger to tank and the grommet for the filler pipe, you'll see why when you drop the tank.
The less gas in the tank the easier it is to deal with the tank.
 

AeroCoupe

lube between the nut and the face. I know my lubes
Founding Member
Oct 28, 2001
5,882
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Claremore, OK
Sep 14, 2025
#63
  • Sep 14, 2025
  • #63
Four things come to mind. The fuel sending unit gasket, the fuel pump hanger gasket, the tank vent gasket, and/or the filler neck grommet.

This is a pic from Mustang5L5’s car and you can see all four item I am referring to. Furthest one to the back is the fuel sending unit, one with the red plug is the fuel pump, white one is the vent, and black one on the side closest in the picture is the fuel neck grommet.

 

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
27,923
10,569
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polk county florida
Sep 14, 2025
#64
  • Sep 14, 2025
  • #64
AeroCoupe said:
Four things come to mind. The fuel sending unit gasket, the fuel pump hanger gasket, the tank vent gasket, and/or the filler neck grommet.

This is a pic from Mustang5L5’s car and you can see all four item I am referring to. Furthest one to the back is the fuel sending unit, one with the red plug is the fuel pump, white one is the vent, and black one on the side closest in the picture is the fuel neck grommet.

Click to expand...
Well he still didn't paint his vent, tragedy.....really....
 

gkomo

now i can hopefully expect to receive the shaft
Aug 2, 2024
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San Diego, CA
Sep 14, 2025
#65
  • Sep 14, 2025
  • #65
When I bought my car and did my first fill up, I had gas pouring out on my driveway. I took it to a shop and they said every orafice on top of the tank was leaking so they replaced all the gaskets. If yours has been sitting I’m sure some of those have dried out.
 
S

Scott_S

Active Member
Jan 16, 2022
90
84
28
Rock Hill, SC
Sep 15, 2025
#66
  • Sep 15, 2025
  • #66
I'll definitely keep an eye on it. It seems to have stopped, for now.


AeroCoupe said:
Four things come to mind. The fuel sending unit gasket, the fuel pump hanger gasket, the tank vent gasket, and/or the filler neck grommet.

This is a pic from Mustang5L5’s car and you can see all four item I am referring to. Furthest one to the back is the fuel sending unit, one with the red plug is the fuel pump, white one is the vent, and black one on the side closest in the picture is the fuel neck grommet.

Click to expand...


Where is the tank vent routed to?
 
S

Scott_S

Active Member
Jan 16, 2022
90
84
28
Rock Hill, SC
Sep 15, 2025
#67
  • Sep 15, 2025
  • #67
The heads and cam in this car are a mystery to me.
Other than the aluminum heads, it has BBK shorty headers and 70mm throttle body, Edelbrock Performer RPM intake, de-cat, H pipe and unknown mufflers.
I'm working on baselining it and will be changing all fluids, etc.
I've been watching the base idle reset videos and feel like that's something I can do at home.
With the bigger than stock cam, do you think 14 degrees BTDC is a good starting point? With a lumpy cam, what's a good idle RPM I should shoot for? Somewhere around 750-825 or so?
 

AeroCoupe

lube between the nut and the face. I know my lubes
Founding Member
Oct 28, 2001
5,882
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Claremore, OK
Sep 15, 2025
#68
  • Sep 15, 2025
  • #68
Scott_S said:
I'll definitely keep an eye on it. It seems to have stopped, for now.





Where is the tank vent routed to?
Click to expand...
It goes to the charcoal canister at the front of the car. It is mounted on the passenger side on the inside of the front frame rail. Not my car but found this pic on a Google search. Mine is relocated due to the ABS pump.

 
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Scott_S

Active Member
Jan 16, 2022
90
84
28
Rock Hill, SC
Sep 15, 2025
#69
  • Sep 15, 2025
  • #69
It seems to not be leaking or venting fumes but, from what I've read, there are probably somd grommets on top of the tank that need replacing.
I'll try to not overfill it and put those on the future "to-do" list.
 
S

Scott_S

Active Member
Jan 16, 2022
90
84
28
Rock Hill, SC
Oct 19, 2025
#70
  • Oct 19, 2025
  • #70
I've had the car with a local Foxbody guy who did the top on my buddies Fox. He's almost done swapping out the quarter window motors and top cylinders. The motors failed shortly after I got the car home. The cylinders worked fine, bug showed signs of weeping. No better time to fix them, right?
He's also snugging up the top and making a few fine adjustments. I also replaced some rubber while he's in there.

I also found these rear speakers, crammed in there and hold on with one screw. I bet that rattled like crazy!
Next stop is the stereo shop, so I can reinstall the interior, shifter, console, etc.

 
Last edited: Oct 19, 2025

AeroCoupe

lube between the nut and the face. I know my lubes
Founding Member
Oct 28, 2001
5,882
4,006
183
Claremore, OK
Oct 19, 2025
#71
  • Oct 19, 2025
  • #71
The crap people do when it comes to car audio.
 

Stang337

Member
Jul 5, 2025
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Los Angeles
Oct 24, 2025
#72
  • Oct 24, 2025
  • #72
Oops, not sure what happened to post

Did you ever replace the top hose and get the plastic covering? When I replaced my hoses last year for my 89, I bought only Motorcraft hoses as they were a perfect fit vs. buying Gates or others from the parts store. I took back all hoses from the parts store! Motorcraft upper hose came with a new plastic cover.

https://ford.oempartsonline.com/oem-parts/ford-motorcraft-trade-upper-hose-km1763?c=bD0yJm49U2VhcmNoIFJlc3VsdHM%3D
 
S

Scott_S

Active Member
Jan 16, 2022
90
84
28
Rock Hill, SC
Oct 24, 2025
#73
  • Oct 24, 2025
  • #73
Not yet.
The first order of business was to get the quarter windows working so I could drive it and not fear the weather. Ended up replacing the weeping lift cylinders and some rubber bits while we are in there.
 
Reactions: General karthief

Stang337

Member
Jul 5, 2025
20
15
13
Los Angeles
Oct 24, 2025
#74
  • Oct 24, 2025
  • #74
BTW- If you drop the tank to install new o-rings for any of the top mounted parts, be sure to check the fuel pump S hose. If you look at my post about my car issues, you'll see what E85 (Ethanol) in our gas does to the S hose. Also look to see if prior owners upgraded the pump, since you have other engine upgrades. Also change the fuel filler neck grommet if you do drop it, $15 from LMR and check the Fuel Pump Bracket Internal Return Cap and Clamp if you pull the fuel pump, as LMR is the only place I found that has it for only $8

​

 
S

Scott_S

Active Member
Jan 16, 2022
90
84
28
Rock Hill, SC
Oct 29, 2025
#75
  • Oct 29, 2025
  • #75
Clutch question: I have reason to think that my clutch cable is stretched or at the end of it's adjustment.

The transmission shifts fine going up through the gears, never grinds, doesn't pop out of gear, etc. However, going DOWN from 3rd to 2nd, it's sometimes hard to find 2nd gear. Again, no grinding or anything, just tough to find.

The car has an adjustable cable and quadrant on it. The pedal doesn't have much free play at rest. The firewall adjuster seems to be out rather far, about 7/8". In the LMR video, they show it screwed almost all the way in.

Is there an adjustment at the transmission that might help? Does anything sound like a simple "out of adjustment" problem?
Lastly, if the cable IS stretched, is there a preferred cable; 5.0Resto, Steeda, Ford Performance?
 

AeroCoupe

lube between the nut and the face. I know my lubes
Founding Member
Oct 28, 2001
5,882
4,006
183
Claremore, OK
Oct 29, 2025
#76
  • Oct 29, 2025
  • #76
I run a Steeda adjustable cable on both cars and they are really good IMO. Do you know if the cable currently in the car is adjustable down at the clutch fork?
 
S

Scott_S

Active Member
Jan 16, 2022
90
84
28
Rock Hill, SC
Oct 30, 2025
#77
  • Oct 30, 2025
  • #77
AeroCoupe said:
I run a Steeda adjustable cable on both cars and they are really good IMO. Do you know if the cable currently in the car is adjustable down at the clutch fork?
Click to expand...
I am assuming it is, because I have the quadrant and firewall adjuster. Doesn't that mean you have an adjustable cable? Is it possible it's just not adjusted correctly?
 

AeroCoupe

lube between the nut and the face. I know my lubes
Founding Member
Oct 28, 2001
5,882
4,006
183
Claremore, OK
Oct 30, 2025
#78
  • Oct 30, 2025
  • #78
Nope. You can run a stock style cable with a quadrant and fire wall adjuster.
 
S

Scott_S

Active Member
Jan 16, 2022
90
84
28
Rock Hill, SC
Oct 31, 2025
#79
  • Oct 31, 2025
  • #79
OK, so educate me here.
On one of the Facebook groups, someone shared this:



It looks like my cable is on the hook farthest away from the firewall. I haven't checked the end at the clutch arm yet. I'll probably have to get it checked when it's at the shop, on a lift.
I don't know what kind of cable I have but I am assuming it's adjustable. The quadrant and adjuster look just like this kit:



IF the cable is adjustable, and since I have a firewall adjuster, should I change the attachment point on the quadrant?
Or, should I start with just a baseline re-adjust: screw adjuster all the way in, adjust cable at the clutch, fine tune at the firewall and leave the quadrant alone?
 

AeroCoupe

lube between the nut and the face. I know my lubes
Founding Member
Oct 28, 2001
5,882
4,006
183
Claremore, OK
Oct 31, 2025
#80
  • Oct 31, 2025
  • #80
If you change the attachment point to the one closest to the firewall then you are going to have all kinds of slop in the cable. You are fighting a cable that needs to be shortened as it is so using the one closest to the firewall will make things worse.
 
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