Got stranded....
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Tuned
Joined: Feb 2019
Posts: 273
Likes: 5
From: Bardwell Tx
Got stranded....
Well... the kids and I got stranded on our first trip out of town. We ran to the neighboring town (boit 20 miles) to look at a 79 F100 (nice truck, ima buy it). We leave and get 1/2 mile down the road and I loose fuel pressure. I coast into the driveway of one my customers. Let it cool down, since it was 92 today, and she fires right up. I let her idle for 2-3 minutes then she looses fuel pressure again and dies. Dang.... I call another local customer who is a Harley mechanic by trade. He comes over and we look at several different items. Long story short... he thinks that the fuel is atomizing and not allowing the sump pump to pick it up. So, I'll call a tow truck tomorrow morning and have her brought home. Guess I need to re-think my fuel delivery system.
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Tuned
Joined: Feb 2019
Posts: 273
Likes: 5
From: Bardwell Tx
I replaced the mechanical pump with a Spectre electric pump a few weeks back. The factory hard fuel line comes up under the steering gear box and is roughly 5" away from the headers. I placed the electric fuel pump inside the engine compartment on the frame rail. The Harley guy says that the heat from the headers, then the electric pump then the high pressure pump is way too much. So, once I get her home ill move the electric pump back by the saddle tank and re-route the fuel line away from the header. Attempt #1 plan. I will definitely be replacing the filters as well.
Posting Guru
Joined: Nov 2011
Posts: 1,302
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From: Burlington, WI
The electric pump is supposed to be as close to the supply tank as possible. Some even say 10" or so at the most. They are designed to push fuel to the motor and not pull it from the tank.
All of our trucks have the fuel line coming up the driver's side frame rail, usually tucking under the motor mount tower, then going to the mechanical pump of right up the side of the motor so I highly doubt that's your problem.
My guess would be vapor lock. When it stalls and loses pressure, take your gas cap off and fire it up.
All of our trucks have the fuel line coming up the driver's side frame rail, usually tucking under the motor mount tower, then going to the mechanical pump of right up the side of the motor so I highly doubt that's your problem.
My guess would be vapor lock. When it stalls and loses pressure, take your gas cap off and fire it up.
Posting Guru
Joined: Nov 2011
Posts: 1,302
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From: Burlington, WI
Then I'd guess you either have a plugged fuel filter or that the sock on the end of your sending unit in the tank is getting plugged up with junk. If that's not the case and everything is clear, then your pump may be bad. It sure wouldn't be the first time a spectre pump took a dump. Especially if it was mounted wrong...then it will overheat and really be junk.
Unless you have a kink in your fuel line somewhere, I highly doubt the way it's routed would fully snuff off the fuel flow. Granted it it always good to keep it as far away from the exhaust as possible, but in this case I don't think that's why your truck isn't running.
Unless you have a kink in your fuel line somewhere, I highly doubt the way it's routed would fully snuff off the fuel flow. Granted it it always good to keep it as far away from the exhaust as possible, but in this case I don't think that's why your truck isn't running.
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Cargo Master
Joined: Jun 2014
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From: Central Florida
In my case I discovered that the fuel line behind the power steering box was crushed, likely by someone working on that steering sometime in the past. It was invisible until I removed the steering box. That combined with other factors such as excess heat, pump malfunction, etc. might yield the effects you've described. I'd recommend using pressure gauges before digging that deep.
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Thread Starter
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Tuned
Joined: Feb 2019
Posts: 273
Likes: 5
From: Bardwell Tx
In my case I discovered that the fuel line behind the power steering box was crushed, likely by someone working on that steering sometime in the past. It was invisible until I removed the steering box. That combined with other factors such as excess heat, pump malfunction, etc. might yield the effects you've described. I'd recommend using pressure gauges before digging that deep.
Tuned
Joined: Apr 2019
Posts: 310
Likes: 50
I replaced the mechanical pump with a Spectre electric pump a few weeks back. The factory hard fuel line comes up under the steering gear box and is roughly 5" away from the headers. I placed the electric fuel pump inside the engine compartment on the frame rail. The Harley guy says that the heat from the headers, then the electric pump then the high pressure pump is way too much. So, once I get her home ill move the electric pump back by the saddle tank and re-route the fuel line away from the header. Attempt #1 plan. I will definitely be replacing the filters as well.
FTE Legend
Joined: Nov 2015
Posts: 30,831
Likes: 4,096
From: Angier, NC
What you saying Willis?
What do you have going on with your truck as you posted you replaced the motor fuel pump with an electric one and a few other things I think so where does this EFI display come in?
Where was it posted you have EFI?
Dave ----
What do you have going on with your truck as you posted you replaced the motor fuel pump with an electric one and a few other things I think so where does this EFI display come in?
Where was it posted you have EFI?
Dave ----