oh wise ones…
Need a little help, and an update.
@Peter_'86_2.9L_Auto & I went out early to try and fetch his 86 2.9 auto from his office parking lot. It cranked, but it wouldn’t catch or start. It’s had fuel problems all along. We bought some gas and topped it off, no joy. We dribbled a little gasoline in the breather, and it kicked right over and immediately died. So we knew we had spark, but no gas was getting to the engine.
I used up my bag of tricks, no joy, so we called a wrecker. While we were waiting on the wrecker, I had the afterthought to just check the Schrader valve on the fuel rail. Without the truck running, a little tiny bit of fuel came out, barely enough to fill up a tire stem cap, so we waited on the wrecker.
When the wrecker got there, we had to push the truck out of the parking space to turn it around so that when he dropped it in my driveway, it was facing the right way. Peter said “let me try it one more time,” and we were all astounded when the thing fired right up! Fortunately, I knew the tow truck driver, tipped him $10, and saved the $180 tow.
Peter drove it to my house without issue, and I parked it out back. Didn’t take long to get the bed off and take a look at what was going on.
The fill neck was like brand new, so that wasn’t the overflow problem when you filled it up. When I moved to the pump, that big square O-ring flat looking gasket that holds the pump assembly in place wasn’t installed properly, and there was a couple little places that weren’t making a seal.
You can see the two darker spots where it was leaking.
When we pulled the pump assembly out, it also looked like it was brand new. When Peter bought the truck, he was told that the pump was “upgraded” to a “Mustang” pump, eliminating the high-pressure pump between the tank and the engine. Well, sort of……
Upon inspecting it, I realized that the bottom of the whole assembly piece had been ground down, split, and this “mustang” pump was inserted in place of the correct Ranger low pressure pump. Looking at the TRS info and also some other sources, I believe this is a holly 19–360 high-pressure pump.
Here’s where we need help. I’m leaning towards just buying the correct pump assembly for inside the fuel tank. Peter apparently also has some level gauge issues, and I think just buying the correct assembly may solve several problems.
However, when the magician put the mustang/holly pump in the fuel tank, he apparently assumed the high pressure pump (on the frame rail under the driver) would no longer be necessary, and removed it. You can also see a relatively new fuel line was run from the tank right up to the fuel rail in the engine. A flow through fuel filter was added underneath the protective bracket that runs off the frame apparently where the high pressure pump was located.
Again, here’s where I/we need help. From my research, both the in tank pump and the high-pressure pump get turned on/off by the computer that’s in the foot well of the passenger seat (new rebuilt). I need some specifics on where to look for the wires for the high-pressure pump. It’s my understanding that although the computer turns both of those pumps on and off when you turn the key on the truck, the computer signals them to operate in different ways at different times once driving, so I just can’t splice over the hot and neutral from the tank pump to the high pressure pump.
Where should I be looking for those wires, and does anyone know what colors they are, etc.?
Finally, could anybody provide me some detail on how this fancy relief valve on the fuel rail operates? I know the high-pressure fuel goes into the rail, and this gizmo is what maintains the pressure and releases extra fuel to the overflow back to the tank. I think installing the high-pressure pump correctly may solve all the problems, but I’d like to know how this gizmo operates, just in case, for when we’re under the hood again if installing the pumps doesn’t solve the problem.
We’ll provide a lot of updates on this truck project after we get over this hurdle. May move it to a different place and just make it a build thread, but we have to get the damn thing running first. Peter has his hands full with life & wife at the moment, so I’m the author, but I’m chatting with him on how he wants to go forward with a build thread ‘cuz it’s his baby. And it is sweet!
Did I mention we need help on these things? Please be specific!