Truck stalls while driving?

One other thing, strangely enough the oil pressure gauge floats a little too although not as much as the fuel gauge but just a little more than normal. I mean normal for me is that it isn't moving barely at all. Anyway, just thought I would mention that too.

Thanks

No, sometimes it will be normal at idle in park for example or drive, and for no apparent reason it will start moving around a little. Not as much as the fuel level gauge but still somewhat abnormally.

Fred

Hi, I don't know if you can still respond here but I have a question. Since putting in the crankshaft sensor and fuel pump the truck hasn't stalled and almost always starts great. I say almost because in the last 2 months or whatever it was since I changed the crankshaft sensor three times it did do one of the things it used to do meaning it didn't start on the first crank. But mostly it starts good.

But ai noticed something recently that ai don't understand. This truck I believe is the CSFI type as opposed to the SFI type. The CAFI is supposed to have a fuel pressure of 60-66 psi at all times from what ai have read even in Chevy's service manual.

When I first replaced the pump, I really didn't check the fuel pressure. But recently, after around a month and a half of changing the pump, I was curious about checking it.

I checked it yesterday with a gauge that I rented that seemed new. With key on, engine off, it immediately goes to about 60psi, but after 1-2 seconds slowly drops down to about 53PSI. This is key on, engine off.

When you start it, idling, it goes to about 50psi and stays there.

Isn't that still low? It's at least 10psi lower than they say it should be.

I don't understand why this truck no matter what you do the fuel pressure is never 60-66psi. It was at 44psi when it was stalling out, so I feel like it only has to drop another 6 pounds and I be in the same situation. Seems kind of ridiculous with a new Delphi pump and supposedly the filter is new also.

Anyway, I appreciate your help.
Fred

Not really. I mean maybe once in a while you might see slight grayish smoke but usually not. I think I see that mostly when it is cold so I'm not even sure it's smoke.

It did go up to about 60psi when rhe keybwas on and engine off but thwn it goes down slowly to about 53psi. Then started it is at 50psi.

Is there any wà y to check fuel injectors on that wirhout removing upper manifold?

Thanks,
Fred

I have seen the fuel trims on a cheap scanner I have and it does show a little rich especially on bank 2. I think it's like - 2-3% on bank 1 and - 8-10% on bank 2. As far as the regulator I'm like 99% sure the he fuel pressure regulator on this truck is under the upper intake manifold with the injectors.

It is normal that when you start it it would go down more than where it is when the engine is off wirh key on? I think I read that it would go down about 5 PSI, but this is going down more.

Fred

One other thing I wanted to ask that I forgot to in the mess I sent. Is it very complicated to change the fuel injectors and regulator which I believe you can buy together in one piece?

This is the part but I think this is an upgraded part because the original ones look different a little.

https://www.amazon.com/Standard-Motor-Products-FJ504-Injector/dp/B000IYP6JI/ref=mp_s_a_1_4?crid=1BC56WXHI0RQE&dib=eyJ2IjoiMSJ9.4X8dY_8LDINQOeNvFPCbrZGM7xpPXyKWxLPzXD8VuzR01klZzckHtanx3Dtv1Wxw6b7Nzro6GNmx9FKeViFE-dCPWVuDDt0dBCavKt0XAOG1o6yk6nfrrrn3CImcx04ouYR4IVfdlMmwvkkEO-3phwfvWOsmJYTRXVzElMRMMzTlxOKdypx-u73wxIgPb1FX_l6leF0KZGidcIudKicrEg.7hjwopQY0Xz9R1iNRZNUiUNtLGKvqgtyGNTM2_JvlE8&dib_tag=se&keywords=fj504+spider+fuel+injector+assembly&qid=1723251010&sprefix=FJ504%2Caps%2C205&sr=8-4

You can see the regulator in the second picture.

Fred

Hi Joe,

Yeah, I know what you mean.

I have another question. A lot of times I smell gas when I am around the truck. Sometimes I have small 2-3 gallon tanks in the bed with gas but I don't think it's that.

I checked underneath and I don't see anything leaking unless it is something on top of the tank that I can't see.

One thing we did notice when I was changing the tank with the friend of mine is that there is a metal hose that is connected to a rubber hose that is connected to the fuel filler neck and we noticed when putting gas in the tank again that that hose apparently leaks on top.

I read on a website that an evaporator system that is not working properly can cause low fuel pressure. Do you think that is possible?

This is the hose I am talking about.

https://www.classicindustries.com/product/all-years/chevrolet/c1500/parts/K94764.html?gad_source=1&gclid=Cj0KCQjwn9y1BhC2ARIsAG5IY-6ResTll3c9yz0W7O1uKLyAnYcUkVP5ySA3rwJLc0sB1pG0OWDBj5gaAvVPEALw_wcB&gclsrc=aw.ds

It's the thin metal hose that is about 10 inches long.

Is it possible to put those sealants on there that are resistant to fuel? I say that because you can't even get that anymore except on that site that I sent you, but you have to buy all of it for $80.00 or whatever?

Fred