I just bought a 1996 psd xlt 4x4 for 4 k. 156 k miles and in real good shape. The guy I bought it from had 3 psd s alltogether. Was selling oldest one. It runs great but when I get up to speeds over 60 it looses power and dies out. When I check the pressure valve on the bottom of the fuel bowl air comes out and truck starts back up. I have noticed fuel leaking from out the back of the fuel valley but have not been able to pinpoint the exact leak location. Not to much leaking but it only leaks intermittently. Would this be a fuel pump problem?

 

I'm not OCD in fact under my hood is pretty dirty but it is dry. So that is what I'd do is dry every thing up whatever takes. If I see any wet spot I find it and fix it.

 

Well I bought the truck Sunday 1-1-17. He said it had a few little issues. I'm working off the list but was curious about if I were correct about fuel pump. I'm a little OCD when it comes to my trucks also. Believe me this psd will be gone over quite well by the time I am thru. It runs wonderfull around town but as soon as I jump up to about 65 to 70 is when the dying begins.it doesn't smoke, its stock and it starts first hit even in 5 below with no heater plugged in.

 

It's happens faster when driving up hill

 

if you could get it on a scanner that will tell you a lot but it does not give you fuel pressure but you could get TP and IVS and a lot of others.With only 156k I wouldn't think fuel pump and kinda a PITA to change especially if it is not your problem.

 

sounds like you have a fuel line leak or a pump leak that is sucking in air


air means less fuel for injectors


Could be just a loose hose at pump or some where else down the line.


Fuel pump isn't that hard to change but get new hoses for it if you do, mine were hard and one was swelled up, PO used wrong type

 

Thanks so much for that info! It makes the most sense out of everything I have heard. I do have a fuel leak. I know that for sure. Every little fix I have done to this truck it just keeps getting better and better.

 

get a pump, hoses and fuel bowl rebuild kit


or go efuel if you can afford it


its not hard cept for the banjo bolt takes a bit to get out flipping the wrench around for a 1/12 turn

 

Rather than throwing parts (which may all have been replaced recently anyway) at it, TEST. Shotgunning parts gets expensive, and can be counter-productive when you replace a potentially nearly new part with a bad aftermarket one. Get the valley clean and DRY, and spread baby powder in it (in the absence of baby powder, use baking soda). Start and run the engine, and rev it up to exercise the lift pump and bring up fuel pressure. The powder will help pinpoint the location of the leak. It could be something as simple as the fuel filter sensor, which is a VERY common leak source. The sensor's function has NO impact on engine operation, so if you're willing to be vigilant about changing the filter, you can replace it with an NPT plug. That's just one example of a variety of possible leak sources, all of which could be affecting fuel pressure at high load.

 

Well I found the leak. Swollen fuel lines between lift pump and fuel bowl. Also fixed exhaust leak and it runs awesome now!

 

I had same issue on mine, hope you got the high temp fuel line or it will swell up again