This truck hed a propane coversion. how do you switch from propane to gas and if there's a switch where is it or how do you bypass it ?

Make sure you have the switches in the correct position to switch from gas to propane.

check the safety switch under the seat, check for spark , check if it is in neutral, check if the hand brake safety switch is working
check that the gas inverter is operational

Propane Conversion Kits for Car, Auto, Truck, Generator ...

www.nashfuel.com/conversionkits.asp

CHEVY 350 V8 PROPANE KIT / HOLLEY 4 BARREL SMALL BLOCK INCLUDES ...DUAL FUEL PROPANE & GAS KIT 4.3 V6 TBI SONOMA S-10 S-15 BLAZER ...MODEL 100 SERIES IS A SINGLE DIAPHRAGM AIR-GAS VALVECARBURETOR/MIXER ... IMPCO JB DESCRIPTION: VAPORIZER WITH 12 VOLTFUELOCK ...

[PDF]Truck Camper Owner's Manual - Travel Lite Campers

www.travellitecampers.com/wp.../Truck-Camper-Owners-Manual.pdf

USING YOUR LP GAS SYSTEM AT LOW TEMPERATURES . ...... The detector is powered by the 12-volt DC system and is always powered as long as the camper is ...Do not block the tailpipes or situate the vehicle in a place where the exhaust ...... as familiar with your camper as you are with your own personal car or truck.

Cheap Homemade Propane Injection System For ... - YouTube

? 1:57
https://www.youtube.com/watch?v=3RAVBoYX5S0
Sep 11, 2008 - Uploaded by hammerdownauto
The best times I've got with this old truck, fuel tank, tool box and all was in the high 15's. .... The engine I'm using 60 years old and the car body is 40 years old. ... I used a generic propaneregulator and 12 volt air solenoid valve. ... just curious what you think this does to the o2 sensors as far as gas / air mix ...

[PDF]"motorized" Manual - Gulf Stream

Probably because the converter that changes liquid propane to gas for the engine to use is not working or if you have liquid directly to the injectors then maybe the change over switch is not operational. Where is concerned it is best to have the problem attended to by gas specialists AS gas is 100 times more dangerous than petrol.

Are you familiar with the propane injection system? If so can you tell me what tests you have run so far and what was inspected? Do you have a fuel type selector switch (to choose between Gas and Propane)?When did this problem start and what is the temperature outside? Propane will not convert from liquid to vapor fast enough, if it is too cold outside. Inspect the plumbing between the intake and the regulator. If there is a leak in the plumbing. The diaphragm inside the regulator will not move or open (to let propane flow to the engine). The regulator can malfunction if it becomes clogged with sludge from the propane. They sell a product that can be added to the propane tank. It is used to keep the fuel system clean. Please write back. If you have more details or information I would like to help. Good luck.

first thought is the mass air flow sensor as this wouldnt be used when its running on gas

Yes, I would however suggest that you try this while sitting still first to make sure the control valve is still working. If it seems to work while sitting still then you can change between tanks anytime. The switch is only operational when the key is on and controls a valve body that changes from tank to tank. So as long as the valve is working and you have fuel or gas in both tanks you just fine.

remove and refill the gas ? it should hold 750grms of gas and i think yours only has about a 150 grms in system ,if R134A expensive put some propane in as that works better .R600A is a mix of propane and butane 70/30 but price of that gone up as well now that R134 is like 700 euros for 12kgs ,i mix my own with my machine .But just propane will work ok

do you shut the propane off before turning on the gas ? try turning the propane off and start the MH on gas .. The mixture of the two is whats causing the problem .. Also you need to run it on gas frequently to keep the carb wet so it wont dry up .. it might be already dried up if you run it on propane alot . might be needin a kit in it.. thanks and holler if you need more Jerry

Dont Laugh.. But Heres I I check'em: Open the radiator cap or coolant tank if radiator cap isnt applicable. Then sniff the coolant.. If It smell like gas vapors.. Then its Definitely a blown/cracked head or gasket..( usually a gasket ) They make test kits for that. But save ya money.. the nose is cheaper.. Thanx.. PS Make sure engine is cool when ya do this..