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have an f350 econoline motorhome with a 460, first time started this season and took a while to start but when it did only lasted 20 seconds and then died, started it again same thing revved up fine but lasted only 20 seconds and died, could it be ignition coil or maybe fuel pump? (no amount of throttle will bring it back when it dies, doesn'nt even try)
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
This makes me think it is the oil pressure sender that controls the fuel pump relay.
...or perhaps the relay itself.
Sometimes its socket gets corroded too.
With this system the fuel pump always sees voltage while cranking but the oil pressure switch (not sender) provides ground from the inertia switch.
This is to prevent seizing the engine if it loses oil pressure.
You might also try resetting the inertia switch.
It is located in the cab and has a button on it.
I'd imagine it would be in the passenger kick panel, since you have a doghouse it would not be located on the passenger side of the transmission hump.
Hope this helps.
...or perhaps the relay itself.
Sometimes its socket gets corroded too.
With this system the fuel pump always sees voltage while cranking but the oil pressure switch (not sender) provides ground from the inertia switch.
This is to prevent seizing the engine if it loses oil pressure.
You might also try resetting the inertia switch.
It is located in the cab and has a button on it.
I'd imagine it would be in the passenger kick panel, since you have a doghouse it would not be located on the passenger side of the transmission hump.
Hope this helps.
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
That ethanol blend is very hygroscopic and will fall out of suspension easily.
But, if he can get it to start it seems like at least some combustible fuel is making it through.
Moderator
Joined: Nov 2007
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From: Denver Metro Area, CO
Erm.......
To my knowledge, this is to prevent adding fuel to a fire after a wreck.
To my knowledge, this is to prevent adding fuel to a fire after a wreck.
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Cargo Master
Joined: Apr 2010
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From: Acworth, GA
have an f350 econoline motorhome with a 460, first time started this season and took a while to start but when it did only lasted 20 seconds and then died, started it again same thing revved up fine but lasted only 20 seconds and died, could it be ignition coil or maybe fuel pump? (no amount of throttle will bring it back when it dies, doesn'nt even try)
If it has been sitting for several months or more, then I say it's bad gas. Drain the tank, get some fresh fuel, clean the plugs, spray some starting fluid in the carb. (if it has one), and try it again.
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f350 motorhome
it has a carb and I put fuel stabilizer in it every year, it always been hard to start but always runs, first year it hasn't stayed running, also tried both fuel tanks when starting(its a 1985).
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
Most fuel stabilizer won't do anything to keep ethanol from picking up water vapor and falling out of suspension.
Have you tried pulling the float bowls and seeing if it has fuel?
Are they clean inside?
Do you have any way to check for voltage at the pumps when you do get it running?
Have you tried pulling the float bowls and seeing if it has fuel?
Are they clean inside?
Do you have any way to check for voltage at the pumps when you do get it running?
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