Technical Tips > Post 84

I think we fixed the problem!

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Jethro:
I hate this intermittent fault! Have now worked out wasn't fuel / oil pressure  relays... last time I could get it to cut out I had power right  the top of fuel tank.... Funny thing is that when I had it in a no fuel pressure - non start I tapped the top of the fuel tank.... and guess what? (new fuel pump fitted don't forget) Vette is now down with Auto Electrician.... been there two weeks! Will keep ya's posted!;29

87Z51:

--- Quote ---Originally posted by Jethro
... Funny thing is that when I had it in a no fuel pressure - non start I tapped the top of the fuel tank.... and guess what? ;29
--- End quote ---


Faulty connection to pump on wire from filler plate or bad connection on plug.

Jethro:
I thinking the same thing! Will let you know what turns out!;30

Jethro:
Think we've found the issue! Well, fingers crossed anyways………

Well, eventually after replacing the fuel pump as previously stated then checking and isolating relays, wiring, ECU yadda, yadda, yadda  we were scratching our heads.... Found some interesting notes on the net about C4's and internal fuel wiring harness breaking down inside the tank....
“In-tank wiring is quickly becoming a major problem due to the age of the C4's. Many terminals are heavily corroded or rusting off. &#8232;The generic in-tank wiring adapters supplied with other installation kits rely on the questionable factory wiring and adds another connection to the equation. This translates to more resistance / voltage loss and an extra potential failure point”.
http://www.lmspeed.com/index.asp?PageAction=VIEWPROD&ProdID=19
Came up with the theory, it's gotta be in the tank? We stripped the sender unit back out of tank and payed closure attention to the wiring harness from the top of fuel lid to pump. Looked sh#t and brittle and under close inspection in places it looked a bit melted? Anyway, decided to replace all the wiring harness from external “L” connector just outside the filler tank plate down to fuel pump and guess what? Vette is purring once again and even the miss / hesitation that I mentioned in overdrive. < hesitates under load especially in top gear and the hunting when hot> has lessened dramatically! I’m gonna drive her for a while and if this stops the intermittent fault eventually replacing the rest of the wiring on fuel system just as outline in “LMSpeed” foot note. Lets hope its fixed FINGERS CROSSED! Keep ya’s posted! P.S. four days later and 600klms still running fine !

:ado:ado:ado

Cameron 77C3:
Thats good news.  Thanks for keeping us in the loop.  Lets hope it's all clear sailing from here on. ;42

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