“Flooding” a 7.3 - it is there something else?

harrietnorth · Sep 23, 2018

Can you “flood” a 7.3. Will an IP let my electric fuel pump push fuel into the cylinders in the time it takes the glow plugs to cycle?

On a cold start, crank and white smoke, means there’s fuel. Glow plugs are new, cranks fast. Takes three to four cycles to get her to fire up?

What am I missing? Thoughts?

jwalterus · Sep 23, 2018

harrietnorth said:
Can you “flood” a 7.3. Will an IP let my electric fuel pump push fuel into the cylinders in the time it takes the glow plugs to cycle?

On a cold start, crank and white smoke, means there’s fuel. Glow plugs are new, cranks fast. Takes three to four cycles to get her to fire up?

What am I missing? Thoughts?

Compression, and "cranks fast" isn't a measurment.
Betcha your starter's weak.

Or it could be timing related, how's it run otherwise?
Clatter when the cold idle advance is engaged?

austin92 · Sep 23, 2018

To your first question, no. Your injectors pop open at about 1800psi and the pump doesn’t just free flow to all 8 cylinders. For the slow starts, what’s the ambient temp? How long does your wait to start light stay on? What’s your truck timed at?

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Thewespaul · Sep 23, 2018

If it’s making a lot of smoke it is possible an injector or two is hanging open when cold and it’s pouring fuel into that cylinder when you first start it until it gets some heat in it. Just a haze of white smoke says more of a timing issue to me. Smoking out the whole neighborhood... time for pump and injectors.

harrietnorth · Sep 23, 2018

jwalterus said:
Compression, and "cranks fast" isn't a measurment.
Betcha your starter's weak.

Or it could be timing related, how's it run otherwise?
Clatter when the cold idle advance is engaged?

When warm, runs like a champ. No smoke, white or black. New starter earlier this year when the mechanical fuel pump gave up the ghost (I cranked the old one to death like a J/A). New batteries, cables, return line kit.

harrietnorth · Sep 23, 2018

Thewespaul said:
If it’s making a lot of smoke it is possible an injector or two is hanging open when cold and it’s pouring fuel into that cylinder when you first start it until it gets some heat in it. Just a haze of white smoke says more of a timing issue to me. Smoking out the whole neighborhood... time for pump and injectors.

No smoke what so ever when running, only smokes from what I think is burning off excess fuel in the start cycle. The glow plug light runs its full cycle (no clicking) and I replaced the glow plugs before the winter season last year. It’s a lovely 73 degrees here in MN today.

harrietnorth · Sep 23, 2018

Based on the feedback so far, timing or injectors sticking.

My guess, probably both. Frank the Tank gets terrible mileage, tired injectors and poor timing would do that.

Dually with a contractor dump, C6 auto - I should get 16ish - I’m 12-14 @ 55mph.

no mufflers · Sep 23, 2018

motorcraft GPs?

harrietnorth · Sep 24, 2018

no mufflers said:
motorcraft GPs?

Yes. I’ve taken heed of the warnings.

pelky350 · Sep 24, 2018

Timing or worn fuel system, or slow cranking.

“Flooding” a 7.3 - it is there something else?

harrietnorth

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no mufflers

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