SET UP: Holley Sniper RobbMc Surge tank Edelbrock high volume 10PSI Fuel pump Sniper CD box Sniper Coil Sniper Hall effect distributor In cabin Electric Fuel Pressure gauge I was having intermittent lean spikes with my Sniper and I thought I traced it to my mechanical fuel pump not producing enough volume/pressure to the the Surge tank. I swapped out my stock mechanical pump for the high volume Edelbrock pump. I am pretty convinced that was at least part of the issue. Fuel pressure has been a steady 63psi at idle and drops down to 58/9 under throttle. That seems pretty normal. I was still seeing some periodic lean spikes on my sniper control panel but the car was running well. Last night I suddenly lost all fuel pressure and the car shut down. I was luckily across the street from autozone. I went and got a test light to see if there was power at the pump, by the time I got back and turned the key on I was showing pressure again. That led me to believe the relay was bad and overheated so I swapped in a new one. 12V 30Amp. I checked all the grounds and those are also solid. Is that the right size? The old relay had no indication of size on it. The real question is here....when I went to start the car again the pressure was at 63 before I turned the key. When it started it dropped down to 20-40 swinging back and forth and then after about 10-15 seconds went back to a solid 63. I drove it home with no further issue. I am pretty confident the surge tank is not overheating and the fuel is not boiling. I have it wrapped in that thick exhaust insulation with the aluminum reflective layer. I reached in and the tank was barely warm. If everything just started up normally without that initial drop in fuel pressure I would be 100% confident it was the relay. However, that initial pressure drop has me confused. If the relay went bad would the throttle body have continued to pull fuel for a period and created an air pocket in the line that had to purge itself when the car restarted and that is why it was still show proper pressure with the key on and car not running? Or is there a potential issue with the fuel pump that is acting like a relay problem? I am going to test the old relay, but given the fuel pressure came back up again after the car cooled it seems like it is a heat related issue which won't show up in a standard test of the relay. I don't feel like I can drive it far now as I don't know for sure whether the issue is the relay, pump or something else. As always, thanks for your time and sage advice!