hot weather problem
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hot weather problem
Greetings.
I've been reading here about heat related problems but I think this is different.
I hope you can help.
My story, after browsing this forum.
Six months ago (Sept 03) I bought a '93 f250 ext cab long box dual tank
351 EFI for use as a delivery vehicle.
This vehicle was registered as a rebuilt vehicle after a front end collision.
With a few exceptions I am happy with this purchase.
My major concern is "hot weather blues"
The first occurrence of this problem was when the temperature approached 80-90F.
I had what I thought was a fuel pump failure on the "rear" tank and switched to the front tank
and finished my day. The next (cooler) morning my "fuel pump" problem went away.
A few weeks later my "fuel pump" problem came back on the "front" tank. (temp about 85F)
I switched to the rear tank and a couple hours later the rear tank failed.
I switched to the front again and it ran fine till the end of the day.
I replaced the fuel filter which was full of black oily gunk.
The next "hot" day My problem came back with a vengeance.
I could run normally for a short time by switching tanks.
This got progressively worse until I sputtered home at a few MPH
by continuously switching tanks. Each time I switched tanks I would get a short spurt of power.
I tripped the Inertia switch and ran it until it wouldn't fire. I pulled the filter and gave my self
a blast of fuel. ...seems to be pressure at the injectors.. filter was clean.
Next morning the problem went away. ..Time passes.
A few mornings ago I moved my truck from my driveway to across the street.
the temperature goes to 90F+. In the afternoon I go to start it and it refuses to fire.
I have spark at the coil. I have fuel at the rail. Flooded? I trip the inertia switch and crank for
a minute or more. Nothing. I reset the switch and squirt a little gas into the air cleaner.
It backfires! I give up and push it back into my driveway.
Next morning it fires up on the first crank.
KOER (with engine running normally) shows O2S lean.
Is this the culprit? and how do I prove it?
Remember , when it runs, it runs well.
And when it's running well it show lean. Is this a problem?
One other point, the the air pump has been removed and the
hose connections are open. Would this generate a O2S lean condition?
I'm planning on putting a camper on this vehicle so I'm
pretty motivated to fix this problem.
Thanks for reading.
John
I've been reading here about heat related problems but I think this is different.
I hope you can help.
My story, after browsing this forum.
Six months ago (Sept 03) I bought a '93 f250 ext cab long box dual tank
351 EFI for use as a delivery vehicle.
This vehicle was registered as a rebuilt vehicle after a front end collision.
With a few exceptions I am happy with this purchase.
My major concern is "hot weather blues"
The first occurrence of this problem was when the temperature approached 80-90F.
I had what I thought was a fuel pump failure on the "rear" tank and switched to the front tank
and finished my day. The next (cooler) morning my "fuel pump" problem went away.
A few weeks later my "fuel pump" problem came back on the "front" tank. (temp about 85F)
I switched to the rear tank and a couple hours later the rear tank failed.
I switched to the front again and it ran fine till the end of the day.
I replaced the fuel filter which was full of black oily gunk.
The next "hot" day My problem came back with a vengeance.
I could run normally for a short time by switching tanks.
This got progressively worse until I sputtered home at a few MPH
by continuously switching tanks. Each time I switched tanks I would get a short spurt of power.
I tripped the Inertia switch and ran it until it wouldn't fire. I pulled the filter and gave my self
a blast of fuel. ...seems to be pressure at the injectors.. filter was clean.
Next morning the problem went away. ..Time passes.
A few mornings ago I moved my truck from my driveway to across the street.
the temperature goes to 90F+. In the afternoon I go to start it and it refuses to fire.
I have spark at the coil. I have fuel at the rail. Flooded? I trip the inertia switch and crank for
a minute or more. Nothing. I reset the switch and squirt a little gas into the air cleaner.
It backfires! I give up and push it back into my driveway.
Next morning it fires up on the first crank.
KOER (with engine running normally) shows O2S lean.
Is this the culprit? and how do I prove it?
Remember , when it runs, it runs well.
And when it's running well it show lean. Is this a problem?
One other point, the the air pump has been removed and the
hose connections are open. Would this generate a O2S lean condition?
I'm planning on putting a camper on this vehicle so I'm
pretty motivated to fix this problem.
Thanks for reading.
John
