The truck is and has been done. 0-rings have been seated and the head re-torqued. I went out the other day and jumped on her and all I can say is...

No throttle cutting out, but there is definate surging. before it was like a backfire/sputter. now its smooth but surging. I also added a fuel pres gauge that is pegged at 15psi idle and when i throttle hard it is making a high pitched squeal. Richard from Coaltrain suggested a regulator to crank the fuel pres down which is the next step.

 

If it's holdin a steady 15psi, what's a regulator gonna do for it. What kinda LP are you runnin. Kinda sounds like the injectors are runin out a fuel.

The high pitched squeel I would lay odds on being the serpantine belt slippin under that new found torque and ready to b replaced.

Have you checked out that regulator valve yet on the VP. That would also cause the Injectors to run low on fuel if it's not holding pressure. I found that if you pull that and put a nail or somethin in it and put it on a scale it should open at about 4 pounds. I don't know any scientific formulas but when I found a good valve and tested it out with air it opened at 14psi and the same one opened at 4 pounds on the scale.

 

Crazytexan I was talking to a guy that had surging problems, he tried all kinds of thing to fix it. Even borrowed a TST that ran good on another truck. Still ran like crap. Spoke to Mark at TST and he suggested he change out his alternater. Had it checked it had a bad diode in it. Changed alternater and no more problems from TST. Said it hauled **** after that. That is also listed on the TST website as a possible problem.

 

The vp and the regulator valve. The belt was also replaced but for a different reason. The noise is No doubt comming from the gauge. Its a Mechanical gauge that only reads 15psi max ans i'm sure i'm pushing more than that. Richard from Coaltrain is the one that suggested perhaps i'm running too much pres to the vp. Thats why i was talkin about the regularot. As for the Altenator.....That beyotch is comming off as soon as i get back home. I Work at NAPA and have no problem defecting things without question.

Like the person you were talkin about, I tried my TST in a friends truck who uses the regular TST and it ran good and his regular in my truck still ran like crap. The Injectors have been Disasembled and thoroughly cleaned while the head was under the knife. And i'm running a Carter pump on the frame to the Stock LP to the VP. LOOK OUT ALTERNATOR....YOUR TIMES UP!

 

I can't even begin to tell you how wrong it is to be runnin that stock pump with the rest of your mods. Even if it works as good as it is even rated to you are way beynd it's rating in your fuel supply needs. For your supply you need the extra capacity of larger lines, pick up tube and high pressure pump. With the TST and you 125hp sticks you aren't even comin close to supplyin enough fuel. Your injectors are runnin dry and that's why the surging.

 

I can see that, But the point still is that All my goodies ran just perfect on this other persons truck with the same sticks as mine and same Fuel setup. Even with 15+ psi Fuel pres, they can be running dry?

What would you suggest...Air dog?

 

You may have 15psi of pressure but I'd bet I'd you used clear line for a section of the supply line you are cavitating the pump and drawing air. That pump can't suck fuel that fast so your suckin it dry also and pulling air.

The options that I can think of are the Air Dog and FASS with or without the air removal systems, in my opinion makes no difference to the guy drivin his truck everyday, only in competion trucks. Myself, I use the Belt Drive LP on mine or you could leave the stock pump in place and run a 2nd pump as a supplemental. Use a pressure swtich to turn it on and off so that when pressure dropped below a certain limit it would automatically turn on. This would be run parallell to the stock pump and not through it.

 

When you say parallel to the stock pump, I have a relay tapped to the stock lp feeding current to the pusher on the frame so when the stock is on so is the pusher. Is this what you are referring to? Sry so many Q's.

And thank you for all the input

 

So you already have a second pump. And ask away, were both learnin here.

 

Yesm, Already that second pump. But TST is saying that the VP itself internally is running out of fuel which is why i changed it, But then you said that regulator valve, that was changed to, and the fuel filter. All i got left is the Alternator like Mark suggested and perhaps a regulator to even the pressure to 15 (given the suggesion i'm WAY above that) Oh i Hate experimenting with things that take along time to tryout. I just want it to RUN. Run like that other persons truck did with all my stuff on his.