109 exmod gremlins are back

[lrover109]

When I had a similar issue with my MOD the problem was in the fuel tank switch - took it apart and the gasket had broken down made a new one and it solved the problem.

[jac04]

There are quite a few 2.25's out there with factory fuel injection.

Great. Didn't know that doing a FI install on a 2.25 was simply a matter of installing some factory parts.
Anyone got as list of what parts I need?

[Terrys]

Yeah Jeff, Just what the LW needs "Once You Go Diesel, You Stink Like A Weasel"

[jac04]

^^Maybe I missed something. I thought we were talking about a petrol FI setup, since the OP has a 2.25 petrol. Diesel - no thanks.

[SafeAirOne]

Great. Didn't know that doing a FI install on a 2.25 was simply a matter of installing some factory parts.
Anyone got as list of what parts I need?

Yeah..I was just being a wiseguy about the diesels already being factory fuel injected.

Getting back to reality and the OP--Something odd about it being an intermittent problem that is being cured (most of the time) by putting some gas down the carb and then having it run flawlessly thereafter. I'd expect that sort of thing to happen all the time, not intermittently.


Have you checked the fuel level in the bowl to see if it's leaking away or if something else strange is going on in there? Even still, I'd expect the pump to refill the bowl in enough time to start up during cranking...

[jac04]

..I was just being a wiseguy ...

(Moe voice) "Oh, a wise guy, eh? Why I oughta..."

Sorry, the heat must be affecting my sarcasm meter.

[siii8873]

Jeff (alias Genius), and larover109 I'm very sure it is the fuel tank switch. I had a spare fuel line so I connected the right tank straight to pump (taking switch out of line) has started ever since. Took valve apart and gasket/seal quite dry and cracked.
Looking for new gasket.
Guess which tank was full!
thanks
Bob

[o2batsea]

Although this site sells many new parts, really the heart of the conversion is the TBI to one barrel adapter. With that you can source a Rochester TBI from any of the thousands of 80's vintage GM 4-6-8 cylinders along with the ECU and harness, an electric fuel pump and away you go. I think with a little creative scrounging one could have EFI on the two and a quarter petrol for only a couple hundred bucks, or less. If one absolutely HAS to have all new I think it could be done for about a thou, but probably less.
I have retrofitted several Chevy marine engines to EFI and one Ford V8. I also started to do the IH 345 but dropped that project. It's all pretty simple stuff and once you get rid of the carb you will have better drivability.

At my nudging, TeriAnn converted her Ford V8 to EFI and has never looked back. Both Ford and GM spent tens of millions developing reliable EFI systems for their cars. Why not take advantage of that?

[siii8873]

UPDATE

well truck is starting fine since I bypassed change over tap. I have found a replacement gasket but not on top of priority list to put it back in service.
Turn signal problem went away for weeks on its own. Until today quit working again. Related question? On the exmod the Tex Magna unit has a bulb that indicates the turn signal. There is also an amber indicator light on the dash panel with the lighting switch. From looking at the wiring diagrams I'm thinking this light should only light when a trailer is connected to the wirirng. Is that correct? I ask because on occasion this light lights up with turn signals, not very often. Genius indicated that he had a similar problem with intermittant turn signals which was in the EXMOD relay. I'm thinking this could be same given this second indicating light flashiing on occasion.

[Les Parker]

Either a ground or that loverly MOD Hella flasher unit has a "hot" spot on it.
Easy to fix if the board has a dry connection.

[akrvr]

It's Fuel!

I had a similar problem with my exMOD. New fuel pump. I bought the new style from RN. The hand lever worked when pumped but it would not work when the engine was cranking. I installed an electric pump and end of problem! Good luck!

[siii8873]

Update

well I think I have everything working (except dual tank switch just havn't got to it) Spent 2 hours looking into the problem. Was trouble shooting with a voltmeter which can fool you. Was getting 12 volts to the #1 terminal of the 6way switch. After finding nothing I put a test light on the terminal and no light. It was the supply to the switch at the terminal block. Renewed that connection all good.

[siii8873]

not so fast

well I thought I had this problem licked, NOT! The lights worked fine for about two weeks after renewing the connector. On Thursday the precurser started, yellow turn indicator on dash panel started flashing again with stalk light and then lost turn signals again. They started working again with the yellow indicator on dash flashing also.
I do have one question, should the dash light be flashing with the turn signals? Or should this flash only when a trailer is hooked up electrically?
Think I need to check out the military relay as suggested earlier.

[jac04]

They started working again with the yellow indicator on dash flashing also.
I do have one question, should the dash light be flashing with the turn signals? Or should this flash only when a trailer is hooked up electrically?
Think I need to check out the military relay as suggested earlier.

The yellow light is only supposed to flash when a trailer is hooked up electrically. I'm not sure how the vehicle "knows" when a trailer is hooked up. On my Lightweight, the yellow light flashes along with the green turn signal indicator at all times. It has done this since the day I bought it. I looked at the wiring diagram once to try to figure it out, but gave up quickly since it didn't appear to be an issue.

[disco2hse]

The orange/yellow light should only flash once if there is no trailer attached and continue to flash when one is. The green turning indicator flashes in both instances. If there is a failure in the circuit the green and orange/yellow will flash once only even though the flasher unit will continue to click. Note that this is dependent on which side the break exists. Break on left circuit and indicator lights will flash once only when indicating left, and vice versa for right.

The same rule applies to the trailer coupling circuit. When the circuit is complete (a trailer is attached and wired in) then the orange/yellow light will continue to flash. Breaks in the circuit on either left or right will exhibit the same results as above but only for the orange/yellow light.

If yours continued to flash Jac, then I would say that someone probably shorted the circuit to make something else work