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Fuel leak

590 Views 6 Replies 4 Participants Last post by  Maryland dieselnick
I noticed a small pool of diesel under the passenger side a couple weeks ago. I checked the fuel bowl lever and all seemed fine. Drove without any issues over the last 2 weeks.

Yesterday the cab had a strong diesel smell. I noticed a ton of diesel under the wheel well on the passenger side, down the side of truck etc. I must have been dumping a good amount when driving.

Checked the fuel line under pedestal and dry. Checked fuel bowl and dry. Checked the drain tube off the fuel bowl and is wet. Not sure if fuel is coming out the drain valve or from somewhere else where the hose sits.

My fuel gauge is usually 55psi and it drops dramatically when I get on it. This morning was running around 48psi and then 20's on flat surfaces. If under load or hill, it drops into the high teens (18-19) psi.

Purchased the fuel bowl replacement parts and will replace the fuel filter tonight.

Is there another location I should be checking?
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I installed a new fuel drain valve assembly. Part is Ford F81Z-9A153-AA.

After doing this job, I regret not purchasing the o-ring kit suggested by Oneof6. The other o-rings are likely getting ready to fail based off the pics.

The valve did not have any cracks or signs of damage. Seals were dissolved. There was a ton of yellow sealant/o-ring on the mating surface. I used a wire brush and diesel fuel to clean prior to installing the new valve.
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Fuel pressure is back to 55-60 at idle and drops into high 40's when under load.
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No leaks and will keep an eye on the other areas mentioned, especially the passenger side fuel line clamp as it will eventually rub a hole.

Appreciate the help and suggestions from everyone.
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