Double wall exhaust system, anybody do it ?

[80BrownK10]

If that's the problem, it's going to be expensive to troubleshoot and fix.

Nah, take a grinder or sawzall and hack them off. Haha

Only the cost to pay someone to weld them back on if that's not the problem and you can't weld it up yourself.

 

[mtnmankev]

I'm set up to weld here, and have many years experience.
The exhaust system was thrown together with whatever I could scrounge after I had to go from headers to stock manifolds, and the muffler shops all quote me $500 to $600 to do the system from the manifolds back, and run the pipes a bit different from the way they are now.

 

[wanderinthru]

Well that makes one of us.. I'm still lost...
Maybe its because I don't have dual tanks and am not familiar with the dual tank line routing.

Were the fuel pump mounted before the selector switch, it would be only pulling out of one tank. If there are 2 tanks involved with a selector switch the fuel pump (electric or manual) must be between the selector switch and the carb.

 

[wanderinthru]

I'm set up to weld here, and have many years experience.
The exhaust system was thrown together with whatever I could scrounge after I had to go from headers to stock manifolds, and the muffler shops all quote me $500 to $600 to do the system from the manifolds back, and run the pipes a bit different from the way they are now.

Kevin, I hope in every way nothing I have said (typed) is in any way liking to "knowing any damn thing" cause I do not! Though, it has been my experience that if there is a problem, and something has wires on it, start with that! Savvy the mech pump issues, and would do the same thing, be my wager your electric fuel pump is getting hot and lying down. Flip the switch and the cool gas hits it and it works for a minute, then that wire having thang heats back up and.....well.....here we are. My opinion.

 

[mtnmankev]

Kevin, I hope in every way nothing I have said (typed) is in any way liking to "knowing any damn thing" cause I do not! Though, it has been my experience that if there is a problem, and something has wires on it, start with that! Savvy the mech pump issues, and would do the same thing, be my wager your electric fuel pump is getting hot and lying down. Flip the switch and the cool gas hits it and it works for a minute, then that wire having thang heats back up and.....well.....here we are. My opinion.

I appreciate all the thoughts and ideas everybody has mentioned, everybody has different levels of experience, some have had weird things happen, others have been lucky to avoid them.
And my mind is boggled by this truck's issues.
Yes, when the cool gas from the passenger side tank hits the pump, it cools things off enough to work again, for a while.
Hence the issue causing the whole dilemna, the fuel coming across the frame crossmember from the driver's side tank is getting heated to the point it turns to vapor, and the only thing that can cause that to happen has to be heat from the exhaust system.
Maybe I should consider plan C or D - weld a bead on the end of the fuel pump pushrod to take up the space the worn cam lobe has produced, but then I lose my ability to pump gas or lock out the flow of gas electrically.
Or, just sell the truck and save the operating expenses, insurance and license plate money.

 

[wanderinthru]

I appreciate all the thoughts and ideas everybody has mentioned, everybody has different levels of experience, some have had weird things happen, others have been lucky to avoid them.
And my mind is boggled by this truck's issues.
Yes, when the cool gas from the passenger side tank hits the pump, it cools things off enough to work again, for a while.
Hence the issue causing the whole dilemna, the fuel coming across the frame crossmember from the driver's side tank is getting heated to the point it turns to vapor, and the only thing that can cause that to happen has to be heat from the exhaust system.
Maybe I should consider plan C or D - weld a bead on the end of the fuel pump pushrod to take up the space the worn cam lobe has produced, but then I lose my ability to pump gas or lock out the flow of gas electrically.
Or, just sell the truck and save the operating expenses, insurance and license plate money.

Or maybe just get a new cheap elec fuel pump and see? Be interesting to know? Electric motors make heat, and they are real good at sitting there running in the heat they make. Introduce other heat and they start acting like..... women. Personally, I do not think you are vapor locked, I believe it just aint pumping enough fuel up to the carb.

 

[mtnmankev]

When the truck "runs out of gas" and coasts to the side of the road, I spray the electric pump with a water bottle, and it starts pumping plenty of gas to the carb, I would say that indicates a vapor lock.
There's no such thing as a cheap electric pump, they all start at 50 bucks and go from there.
The brand new one I got at NAPA a week ago set me back 80 dollars.
10% of my monthly income.

 

[wanderinthru]

When the truck "runs out of gas" and coasts to the side of the road, I spray the electric pump with a water bottle, and it starts pumping plenty of gas to the carb, I would say that indicates a vapor lock.
There's no such thing as a cheap electric pump, they all start at 50 bucks and go from there.
The brand new one I got at NAPA a week ago set me back 80 dollars.
10% of my monthly income.

See your point, but spraying it down with water also cools the little elec pump motor. Did not see where you had just bought a new pump, sorry, missed that...... So? either, vapor lock or hot fuel pump, where is the heat coming from? Maybe a little fuel line and a couple zip ties and place the pump on the outside of the frame away from the exhaust heat??

 

[jake wells]

Ethanol gas is more prone to vapor locking in heat than regular gasoline a old tractor at work does it but with ethanol free it doesn't do it.

 

[jake wells]

I would place a heat shield around the electric pump and i would recommend a edelbrock brand electric pump.
or mount the pump on the frame further back away from the exhaust

 

[mtnmankev]

Ethanol gas is more prone to vapor locking in heat than regular gasoline a old tractor at work does it but with ethanol free it doesn't do it.

What's weird is, I have driven the truck for 4 years with no issues using an electric pump, those motorhome mufflers and ethanol gas.
Until last summer when it started acting up on days above 50 to 60 degrees.

 

[jake wells]

i had a 83 s10 about 10 years ago with a electric pump that would vapor lock after driving on the highway turned out if i opened the gas cap a little it would start pumping fine because the tank didn't vent at all.

 

[jake wells]

What's weird is, I have driven the truck for 4 years with no issues using an electric pump, those motorhome mufflers and ethanol gas.
Until last summer when it started acting up on days above 50 to 60 degrees.

you could try mounting the pump inside the cab behind the seat to keep it away from heat. and check to see if the tank is venting at all.

 

[mtnmankev]

you could try mounting the pump inside the cab behind the seat to keep it away from heat. and check to see if the tank is venting at all.

The body of the truck is in excellent condition, so I don't want to drill holes in the floor of the cab.
I understand your point and it does make sense.
Now, if I had a rust bucket truck, it would be a non issue to poke a couple rusted out spots to run the fuel lines.

 

[jake wells]

A excellent condition square... what kind of black magic is this?