Fuel Pressure regulator...(plug/wire swap part II)

[SHOfun 93]

Scott,
The fuel pump has been working fine as far as active flow ever since I installed it over a month ago. These problems only happened after I pulled the intake off and swapped plugs and wires. All connections to the coil pack are correct, I have plenty of spark, just no fuel. The hookups on the fuel filter are fine, and the pump sounds like it is priming like a champ.

Could the fuel pump have problems even though she audibly sounds okay? I mean after cranking a bunch, she still didn't have ANY fuel pressure in the rails. OR is there something that I could have either blocked off or impeded in the reinstallation of the intake that I didn't before? I mean I pulled this intake off half a dozen times and haven't ever had this kind of problem.
Or is there something on or around the fuel pump assembly, I.E. a motorcraft part not directly associated with the fuel pump itself. The pump itself was purchased USED headbang off of a fellow mustang owner, and I have ordered a new pump in case I can't diagnose the problem before Friday for the run. But it just has me at a loss that the fuel pump sounds like she is priming and then nothing in the rails. I guess I need to disconnect all the lines in a gradual fashion and see where I lose the fuel pressure.

 

[projectSHO89]

Since the problem occured coincidentally to the intake removal, concentrate on the fuel lines at or near the rails.

Disconnect the pressure line (after safely de-pressurizing the system), slip a hose or rubber line over it and direct the hose to a suitable container. Try priming the pump with any fuel flow directed safely into a container. This will tell you if your pump can deliver volume of fuel to the inlet of the rail and the pulse dampener.

If that test passes, I would look at the banjo bolt on the rail connector and at the pulse dampener for possible clogs or restrictions.

Steve

<small>[ June 10, 2003, 11:10 PM: Message edited by: projectSHO89 ]</small>

 

[luigisho]

I remember torquing the **** out of a vacuum hose when I reinstalled the intake once. If the problems coincided with intake removal and reinstall then that's the first place to look. Pull the intake off and poke around.

 

[SHOfun 93]

Thanks guys, looks like I have a full day ahead of me tomorrow! Oh and Steve, which line by the passenger side fuel rail is the input line? Also what is the "banjo bolt"? TIA

<small>[ June 11, 2003, 12:32 AM: Message edited by: SHOfun 93 ]</small>

 

[SHOfun 93]

Well here is the latest. I pulled the lines before and after the fuel filter, and we still are good for fuel flow there. Then I removed the intake again, and removed the line on the fuel rail on the passenger side toward the front of the car. I primed the fuel pump and fuel shot out everywhere! I am really at a loss now. It seems that fuel is getting to the rails, but it isn't holding pressure enough to inject the injectors? This one has really got me stumped..... headbang or is there some type of fuse/plug that I am not getting hooked up or may have disconnected that isn't allowing the fuel to inject? rant

<small>[ June 11, 2003, 08:15 PM: Message edited by: SHOfun 93 ]</small>

 

[luigisho]

Do you have fuel spraying from the injectors? If so then maybe fuel isn't the problem. Coud be timing or vacuum?

 

[Jr's Sho]

I'm thinking maybe timing, or a computer problem. If you have pressure to the rails, then it seems like fuel isn't your problem. Did you check spark at all the cylinders or just one? Maybe just a couple of cylinders are getting fire. Hope you figure it out.

 

[SHOfun 93]

Okay after taking a closer look with my g/f priming the pump the pressure coming out of the lines is WEEEAAAK. I mean I could **** harder than it is coming out. I swapped out the FPR (probably for nothing , and I did notice that the fuel pump's pitch did drop after priming. I bought the pump used off of a buddys 94 mustang. I think that this pump is too weak, and/or shot. I have a new pump right here next to the computer from APE, so now it is on to that.....keep ya posted. BTW, I DO have spark to ALL cylinders. I checked that after installing the intake again this morning.. wink

 

[Jr's Sho]

I may have forgot, but did you check for any codes? Have you made sure the timing belt didn't break? Just some other possible problems. I don't know what to tell you...hope you get it soon. How's the 1992?

 

[masho95]

You recently posted that you checked fuel pressure before and after the filter and that everything was good. If you have good pressure there and little or no pressure at the pulse dampner on the fuel rail then it looks like you have a clogged fuel line. How did you check the pressure at the fuel filter? Did you disconnect the output first then check for pressure? I can hardly see how the fuel line would be clogged since you pulled the intake... Disconnect the output of the fuel filter (bottom connector) and check pressure again. Can't wait to hear what this turns out to be!

This problem has nothing to do with the timing belt, he has no fuel pressure at the fuel rails.

<small>[ June 12, 2003, 09:48 PM: Message edited by: masho95 ]</small>