donkeylips
Well-known member
This is a GGSX we just put back together with parts from a VR4 donor car. The car has a completely stock setup. It has the factory fuel feed line from the pump to right before the front subframe where it attaches to a -6 fuel feed line. Then it has an aftermarket fuel filter, and a -6 line from the filter to the rail with an STM fitting.
The car came with a 255 pump(not rewired) and when I went to start it for the first time it would just crank and crank. So I took the feed line off the rail, put 12V to the check connector and could hear it running but no fuel came out.
So first I swapped in a known good stock sending unit assembly. Pulled it right off of a running car. It behaved exactly the same way as the 255.
Then I disconnected the line before the fuel filter to eliminate that as the cause and still nothing. After feeling the lines and disconnecting them at the pump, I have determined that it is definitely flowing, and at least gets to about halfway up the length of the car. I'm pretty sure I don't have any blockages in the lines.
So does this mean that the problem must be that the pump isn't getting enough voltage? Should a rewire solve this issue? I need to move the car from where it's sitting today... is there a quick temp fix I should try?
After looking at the manual, I'm thinking I should look at the fuel pump connector(E33) and check my voltage across pins 1 and 3 while applying 12V to the check connector. I can do this on my 2 GVR4s to compare and see if I get a different value.
The car came with a 255 pump(not rewired) and when I went to start it for the first time it would just crank and crank. So I took the feed line off the rail, put 12V to the check connector and could hear it running but no fuel came out.
So first I swapped in a known good stock sending unit assembly. Pulled it right off of a running car. It behaved exactly the same way as the 255.
Then I disconnected the line before the fuel filter to eliminate that as the cause and still nothing. After feeling the lines and disconnecting them at the pump, I have determined that it is definitely flowing, and at least gets to about halfway up the length of the car. I'm pretty sure I don't have any blockages in the lines.
So does this mean that the problem must be that the pump isn't getting enough voltage? Should a rewire solve this issue? I need to move the car from where it's sitting today... is there a quick temp fix I should try?
After looking at the manual, I'm thinking I should look at the fuel pump connector(E33) and check my voltage across pins 1 and 3 while applying 12V to the check connector. I can do this on my 2 GVR4s to compare and see if I get a different value.
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