Backfire when starting van

Tintop

Tintop

Active Member
I hadn't drove the van in a few months, I filled the tank and halfway thru filling it I put some millers fuel vsp power plus in with the full tank of petrol , I am wondering could this cause fuel mixture to be to rich and so cause the backfiring , I had no backfire when I drove it last time without the millers , allso the petrol tank had very little fuel in it before I filled it up so was sitting for a few months that way , I just think it's to much of a coincidence that as soon as I put the millers in it has started to backfire, any suggestions on how to sort out would be really appreciated. Maybe I need to adjust the fuel mixture thingy
 
I've used the Millers for years with no problem and there should be no need to adjust the mixture. It may be that debris has been disturbed in the tank and caused a partial blockage in the fuel system. A backfire can be associated with an electrical issue, check around the coil connections to make sure they are all secure.
 
Panky said:
I've used the Millers for years with no problem and there should be no need to adjust the mixture. It may be that debris has been disturbed in the tank and caused a partial blockage in the fuel system. A backfire can be associated with an electrical issue, check around the coil connections to make sure they are all secure.
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I have checked all leads electrics ect all seems ok, so if it is down to debris in fuel , what's the best way to go about it ? Remove and clean tank ect or just drive it and hopefully it clears itself ?
 
Can the van be driven if backfiring , it backfired when starting so not sure if it will keep backfiring if I drive it , I was thinking of bringing it on a good drive and hopefully if its dirt in the fuel lines it will free itself on a good run , other than that I will have to remove tank and clean it properly
 
As long as it's not doing it constantly but first check the small wires on the coil, I've known the the wires into the spade connectors to start breaking down causing issues. If that's OK check the fuel pump as any debris might get caught in there. If the blockage is in the carb a trick we often use is to start the engine with the filter elbow removed, then rev the engine and place the palm of your hand over the intake to the carb, there is a lot of suction so prepare yourself. Repeat this a few times and this will sometimes clear any blockage due to the high suction.
 
Were is fuel pump located ,is it at the back or front of van , I assume it's different to the fuel sender, is is under the glass dome what I thought was a filter?
 
Good luck :). I remember when I spent days trying to figure out why mine wouldn’t start after winter. I replaced the condenser before trying to start it as that had been the reason last year. It wouldn’t start so though it might be the coil. New coil and still no spark. Fitted an electronic dizzy and still no spark. Got another coil and still nothing. Put old dizzy back on. In the end it the new condenser I fitted at the very beginning was bad. I blew the new electronic dizzy wiring it up wrong and hadn’t needed to buy the 2 coils. If I hadn’t started fiddling it would have started fine
 
Checked what I could check and didnt see anything out of the ordinary, may just drop the tank and give it a proper clean and see how it goes from there, still haven't started it
 
I would have thought you would find evidence of crud in the tank trapped in the filter? If all the lead connections are clean and well connected etc then maybe try taking the air pipe off carb and put your hand over it like Panky suggests. Probably easier than taking tank off straight away. Can you drain the fuel in situ to see if it’s clean?
 
S0updragon said:
I would have thought you would find evidence of crud in the tank trapped in the filter? If all the lead connections are clean and well connected etc then maybe try taking the air pipe off carb and put your hand over it like Panky suggests. Probably easier than taking tank off straight away. Can you drain the fuel in situ to see if it’s clean?
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Hi soupdragon I checked all leads took off distributer cap and put back on ,all leads are good and tight , so anyway went back out to start van and the wire that goes to the oil sensor was loose , so I put it back on and started the van and there was no backfire , I dont understand how that wire would cause it to backfire,, maybe me reconnecting everything sort it out , could the wire coming from coil to oil sensor cause a backfire , I wouldn't think so , I am a bit confused but for now the van is starting without backfiring ? I will bring it for a test drive tommorow THANKS for ur help.
 
It could be as simple as fiddling with the wires has created a better connection or any blockage had cleared itself. Go on your trip and enjoy yourself :)
 
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