1973 CJ6

[M4wdFab]

rear harness bar in

[rejeep]

1000 Mile Shakedown completed....
now time for the 1000 mile tear down and re torque (y)

Some things to button up / tweak:

- Fuel issues:  Need to address pump location due to cavitation and heat under the Jeep..
                      - In tank pump, heat shielding
- Tearing into the steering column to figure our 'Phantom Horn' issue
                      - possible spacer at end of column
- Clutch pedal return spring and adjustment of slave cyl rod.
- Need to lengthen and re route drive side brake line.
- Hazard switch wire
- Front marker lights
- Rear seat restraints
- Storage solution for back

[rejeep]

do you need to support an in tank fuel pump?  or can it just float around?

[mr.mindless]

the full OE type as on the left are intended to be suspended from the top collar. to run the type on the right in-tank it should be secured to the tank or somehow suspended from the access panel on a bracket.

[M4wdFab]

the picture on the right is confusing to me, never seen such a thing

[mr.mindless]

I think I've seen that type in use in fuel cell multi-pickup setups. didn't dig through liquid iron facebook for an example but I'm almost sure it's Timmay's work I'm thinking of.

[Wingman]

Road duty would be fine but off-road, either in the pic seem less than optimal.  That's a bit of mass at the end of a rubber hose that has liquid sloshing forces acting on it.

I'm picturing a GM style with the spring-loaded sliders to help support/stabilize it.

[rejeep]

I don't know what's on the left in that picture..
just the sending unit and suspended pump

flare sending unit and call it a day?

[rejeep]

been poking around this weekend making a sending unit...
need to find some good fuel resistant epoxy to seal up the wires and I might be ready to drop the tank..

Whats the general concessions about exhaust next to gas tanks?  I know on some euro stuff the exhaust runs via a notch through the tank almost..  Im either being overly cautious or paranoid about heat now..

[Wingman]

Vent the tank and worry about it when it's a problem?

[rejeep]

tank vented.. its a problem..

Almost ever since new, I have been getting pump cavitation and shut down..  will re start 5 min later
Howell points to vapor lock or FP cavitation..  My external pump is higher than it should be..  also knew that since day 1.. thought i would get away with it..

I think the road heat and height of the pump is making it susceptible to cavitation and vapor lock..

my first plan off attack is putting the pump in the tank.. keep it Low and out of the way of any road heat
some muffler and pipe shielding..

last resort.. move the fuel lines to the other side of the frame 

[Wingman]

If your fuel pump is in the tank, your heat issues should vanish and exhaust placement should become irrelevant unless pointed right at it.

[mr.mindless]

Ever point a temp gun at the tank? I forget what the vapor point is, but it’s low.

If the tailpipe runs tight to the tank a heat shield may help tank temps. Once under pressure it should be fine though.


Tapatalking in traffic

[M4wdFab]

did you ever driver around in the summer with the gas cap off the tank like i told you to do




vents or filtration clogged or EMS issue.   call bs on heat or cavitation

[rejeep]

yes..
Drove around last summer with cap off and vents open to atmosphere..  same shut down problem
went through all the trouble of installing factory vent system/purge canister, etc...

my first experience with it this year was driving down to you.. at the exit off the hwy I had an engine shut down.

my next most noticeable one was driving up to carter on a hot day..
2500 RPM 70 MPH and dies..
pulled over made a few calls, engine started right back up... had a couple of engine surges on the rest of the trip.
(took ghetto route home to avoid the hwy.. no issue)

same happened to me going to get take out in Perrington..  died on 490 after doing 70 for a bit..

Sat I took my oldest around the neighborhood (again hot day) pulled into a friends driveway and couldn't restart for a few min..

one drive it has never happened on was out of the garage in the AM to the office...

I have a FP gauge at the TB.. during these waiting periods I don't hear the FP kicking on with key power and there is no pressure @ TB.. I never loose electronics, radio doesn't die, and no CEL.

My pump is currently mounted rather high for an external pump.. I always knew this could be an issue.  Other CJ5/6 people who run a Howell told me to mount to frame rail first before going in tank..  I figured if I'm moving it.. I'm doing it once.
There really isn't an out of the way place on the frame rail.. and my exhaust runs on the driver side..

I haven't tore into this yet if you think there is a more viable solution.
when I called Howell they kinda sent me down this path...  to move the pump, saying that in tank is best if possible..

what do I know.. I only sell parts.. I don't design them