TOP END REFINISHING

[Schrade]

Ok - I had (relatively sure hereof) a blocked OPEN check valve in the tank.

Test:

Both fuses in.

Power to test terminal.

Pinch feed line BEFORE rails inlet.

Power off test terminal. Pressure held @ 52.

Release pinch on rail feed inlet. Pressure dropped IMMEDIATELY ~12 to 40.*

Test again, NO PINCH, power off.

Pressure dropped VERY SLOWLY:
0:15 = 48
0:30 = 47
0:45 = 47
1:00 = 47
2:00 = 46
5:00 = 45

*This QUICK reverse flow MUST HAVE pushed SOMEthing [obstruction / sticking check valve] back OUT OF IN-TANK CHECK VALVE.

Could this be ANYthing else???????

[Schrade]

This is the post I was referring to here Franke...

Give it a read through if ya' got a moment; and comment???

Originally Posted by Schrade

Ok - I had (relatively sure hereof) a blocked OPEN check valve in the tank.

Test:

Both fuses in.

Power to test terminal.

Pinch feed line BEFORE rails inlet.

Power off test terminal. Pressure held @ 52.

Release pinch on rail feed inlet. Pressure dropped IMMEDIATELY ~12 to 40.*

Test again, NO PINCH, then power off.

Pressure dropped VERY SLOWLY:
0:15 = 48
0:30 = 47
0:45 = 47
1:00 = 47
2:00 = 46
5:00 = 45



* This QUICK reverse flow MUST HAVE pushed SOMEthing back OUT OF IN-TANK CHECK VALVE.

OR

UN-stuck it, to free range of motion of the check valve...

Could this be ANYthing else???????

[Franke]

I don't think so as the CC tube is larger in inside diameter I think. Jerry's has a new CC pipe however its a bit pricey. I was thinking that maybe you could wiggle a slightly smaller PVC pipe or something similar through the hose up to the defect and then clamp it. Maybe not but I tend to analyze why parts like that fail since there isn't a lot of pressure etc on them. Got to be oil and heat breakdown or friction on a adjacent part. High temp RTV might work too if allowed to setup properly.

[Dynomite]

My TPS connector harness goes in front of first injector over the top of the PCV connector (and charcoal connector on 90') to Plenum.

I use blue and red Loctite where you are using grease on many of those bolts

[Franke]

Like Dyno says in front of first injector. Pic #4 page 1 and pic #11 especially. Looks like it was under the plenum vac tubes. Check those vacuum hoses to see if they are soft.

[Franke]

Someone has rerouted that line (lined one in pic) as it is supposed to be in front of the Pwr strg pump on the top of the clamp. Look at clamp and you will see nothing on top curved part. It follows the other vac line that goes to the front of the pump. Is that coolant pipe gasket on backwards?

[Franke]

Yes someone rerouted that line before you got it. Mine does go in front of the PS pump on the top of the clamp with the larger one on the bottom of the clamp. I suspect that at some point that hose was a source of a vac leak so the cut/splice easiest route method was embraced. While it will work ok it isn't factory correct and there in is the reason for the zip tie. No codes and I don't believe the hesitation source.

[Franke]

Schrade, What no spring ring clamps? Look at page 1 #4 which shows the coolant hoses before removal. Maybe that will help ya as I see some markings on the hoses. Also, with the ignition off both of the fuel pumps are routed to the test connector through the fuel pump relays.

[Schrade]

Originally Posted by Franke

Schrade, What no spring ring clamps? Look at page 1 #4 which shows the coolant hoses before removal. Maybe that will help ya as I see some markings on the hoses. Also, with the ignition off both of the fuel pumps are routed to the test connector through the fuel pump relays.

THanks again Sir...

I had P side 'marked', but the Trans-X swelled out the scratched-in mark. Stuff is amazing.

Those spring clamps leave a stinger in yer paw when they unload from pliers OuCH! And no way to rock the crossover and seat the hoses with OEM clamps on...

FP test tomorrow. Have to pull the sec pump fuse I suppose. And still need to do resistance check for the SP wires. That's where this part all started. No clue what spec resistance is on SP wires...

THEN... pull plugs. Put the Shop-Vac on 3 and try to pull the moth, if still in there. And I'm thinking rotate the crank 90', and pull 4, then 90' more, 3, 90' more 6, etc, to pull any jam that drained into each hole. AND, if I can figure out which hole is on the squeeze for each 90' pull, get a static squeeze check at the same time...

Time to start really thinkin' here... but I got dual exhaust if my CPU overheats from thinkin' too hard

[Franke]

Schrade, I would repeat this test a little more. After assembly of plenum chart A-7 on page 6e3-a-29 may help you diagnose if this is a this fuel pressure problem. I'm sure you have or had air in the system so the screwy readings. May still have a little air in there yet. The fuel from the tank goes to the fuel rails first and then to the regulator and then back to the tank. There is further testing with caution on testing the regulator in this chart and return fuel line pinch. I really don't think you will have an issue if all the air is out.