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Propane 4.3 turbo no start need help

Honky Lips

Well-known member
Joined
May 21, 2020
Member Number
876
Messages
59
Ok. So I bought a buggy with a gm 4.3 vortec engine. Propane fuel system. And turbocharged.

It is a bastard to get started. First I had to replace the engine because it had water in it. And while I have got it to start a couple times. It’s a chore. And not wheelable.

anyone really knowledgeable with propane?

I rebuilt the iMpco model E vaporizer. And put a new diaphragm in the mixer/throttle body. When I press the purge button propane flows.
 

Adamwende

Red Skull Member
Joined
May 20, 2020
Member Number
604
Messages
166
Location
Arizona
Well, there’s only one wire to make the whole system work. I’d start there.
 

Honky Lips

Well-known member
Joined
May 21, 2020
Member Number
876
Messages
59
Pressing the purge button on the vaporizer sends propane into the throttlebody. It’s getting fuel through but I don’t know if it’s enough or not enough for something but rebuilding the vaporizer seemed really easy and straightforward
 

Honky Lips

Well-known member
Joined
May 21, 2020
Member Number
876
Messages
59
Draw through. Throttle body/mixer is before the turbo
 

Byro

Lurkin’
Joined
May 19, 2020
Member Number
252
Messages
317
Location
East Canton, OH
Not sure how that mixer works, my M&M was vacuum operated to pull the diaphragm open. If you have no vacuum it’s not gonna pull the diaphragm open.
 

ToyotaSub

Toyota goes woo woo
Joined
May 24, 2020
Member Number
1321
Messages
51
Location
Upurbuckaluk
What sort of ignition system do you have on it? Hard starting is often base timing issues with propane. How does it run once started?

Post most details about the engine, turbo, etc. Pics maybe.

Also if it's been around a while the mixer might be fucked. The Impco 425 is a wear part. The idle diaphragm tears and they tend to go fat because of that, and they wear out internally too.
 

ToyotaSub

Toyota goes woo woo
Joined
May 24, 2020
Member Number
1321
Messages
51
Location
Upurbuckaluk
Also make sure you have the arm height correct in the regulator. They need to be tweaked normally. If it is not correct it will not work right.
 

m j

New member
Joined
May 22, 2020
Member Number
1228
Messages
4
pics? is the coolant flowing in the reg?
 

m016324

Member
Joined
May 20, 2020
Member Number
629
Messages
12
pics? is the coolant flowing in the reg?

Agree on looking at this too. Hard starting on propane also can be caused by the mixer being cold. Depending on how cold it is you can actually warm the mixer case some to help make the starting easier.

-ben
 

ScrewLoose

Rock Buggy Abuser
Joined
May 19, 2020
Member Number
353
Messages
13
Location
Texas
Obviously don't use a vacuum lock off on this setup, use electric. Double check the timing it should spin and fire very easily. If it cranks slow your timing is likely a ways off.
 
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