Fuel leak

582 Views 6 Replies 4 Participants Last post by Maryland dieselnick, 3 mo ago

Rocketfuel

Discussion Starter · 3 mo ago

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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· #2 · 3 mo ago

Rocketfuel said:
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?

Those two are the most likely, if the drain tube is as you write "wet" that's probably it. I would give it the dry paper towel test..... wrap a dry paper towel around the tube end and turn the key on, engine off. The pump will cycle for about 10 seconds. Do that twice. If the paper towel has fuel on it, bad valve seal.
The solution is rebuilding the drain valve (o-rings) or replacing the valve as an assembly. If you rebuild or buy an assembly one can find both at dieselorings.com. Recommend the florosilicon o-rings, the blue o-rings. Rebuild o-rings are less than 10 bucks and an entire valve assy is about 50 bucks.

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