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David McCollam · 08-02-2005

Let me ask some background questions. What did you take the EFI system from that you are using? Is it the Manta/Ascona Bosch L-Jetronic? If so, Gil is 100% correct. At idle you should have about 40-44 psi of pressure at the fuel rail. This measurement is easily taken by placing a 3/8 inch tee fitting on the cold start feed line that fits on the the cold start injector at the rear of the intake manifold.

If, on the other hand, you have the LE-Jetronic with no cold start valve, you must obtain the input fuel pressure from the high pressure side of the fuel system going to the fuel rail.

I've experienced over pressure of 100 PSI based on the return line being blocked. You'd know it if that were present. You'd have fuel coming out everywhere. Not good! I don't think that system would operate if you only had 7 PSI on the rail.

Where is it plumbed in and how did it take 2 hours?

Good luck with that.

08-02-2005	#8 (permalink)
David McCollam Member Join Date: Jan 2004 Location: Texas Posts: 589	Fuel Pressure Let me ask some background questions. What did you take the EFI system from that you are using? Is it the Manta/Ascona Bosch L-Jetronic? If so, Gil is 100% correct. At idle you should have about 40-44 psi of pressure at the fuel rail. This measurement is easily taken by placing a 3/8 inch tee fitting on the cold start feed line that fits on the the cold start injector at the rear of the intake manifold. If, on the other hand, you have the LE-Jetronic with no cold start valve, you must obtain the input fuel pressure from the high pressure side of the fuel system going to the fuel rail. I've experienced over pressure of 100 PSI based on the return line being blocked. You'd know it if that were present. You'd have fuel coming out everywhere. Not good! I don't think that system would operate if you only had 7 PSI on the rail. Where is it plumbed in and how did it take 2 hours? Good luck with that.