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By Chris_Guthrie · Posted
I'll rent a fuel pressure tester soon and report back. -
By Chris_Guthrie · Posted
It has a separate fused 10ga wire running from the battery to the relay in the trunk. 10ga on the ground also. -
By Chris_Guthrie · Posted
Actually I did the fuel pump rewire 2 days after the issues started. Grinded away the paint and grounded it to the chassis behind the right panel in the trunk. -
well, to check fuel pressure all you need is a gauge and a 8mm joiner with a gauge port in the inlet fuel line; if it stalls at idle when hot you can open the bonnet and check pressure at that time; the fuel pump is a potential cause for what you are describing but it could also be wiring to the pump getting hot. You haven't mentioned that the factory fuel flow control on the fuel pump earth is removed. So either way, it is worth running a suitably sized and fused wire from the battery to pin 30 in a new relay in the boot. Use the ECU trigger wire into the standard fuel relay to pin 86. Earth relay pin 85 and the Fuel Pump negative (nice big wire for the latter too). Run relay pin 86 pin to Fuel Pump +. That will remove multiple possible fuel pump wiring issues in a 30+ year old car -
I've been running a 525 for years with the standard hat and FPR in the stagea (mine has a 32 gtr fuel rail and stagea and 32 hat and tank setup are the same) without an issue with base fuel pressure. You said when you disconnected the return it is OK, did you do so at the fuel rail or the fuel hat? Either way I'd be looking for blockages or in the case of the tank kinks in the lines downstream Note I did however have an issue with the current required for the 460 melting the fuel hat.
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