Hey guys and girls,finally got the EFI installed in my 67,been a nightmare,took it on its maiden voyage on Saturday,ran incredible but there was a pulsing noise,I had an in tank fuel module installed,it literally pulses through the whole car,my mechanic insisted on installing a copper/line and not the rubber line that came with the unit,above the frame the line is bent around the frame,he’s insisting that its fine and not obstructing flow,Sunday wife and I took off to Maine to spend the day,halfway there the gas /air ratio which was running around 13-14 jumped up to 20 percent ,went into the red on the hand held and started shutting down,stalled 3times on the highway,limped home,call d Holley yesterday,he thought there might be an issue with the oxygen censor or the in tank pump,he recommended dropping the tank and field testing the pump, I’m wishing I never did it,so many people I know recommend it and they have not had an issue,Holley did said they will send me a new pump but not sure that’s the issue,not sure where it goes from here,got a ton of money invested trying to get the car running at it’s best and now I can’t drive it at all,any thoughts or advice you can send my way will be appreciated ,anyone have an issue with it?as always thanks
First off, change out the fuel filters and try it again. Clogged filters gave me fits (stalling and pump noise) after the Holley Sniper was installed in my '75 Ranchero with externally mounted fuel pump. Mine clogged because the mechanic (I was 2,000 miles away) never flushed out the new fuel tank as must be done. However, with a newly mounted internal fuel pump in your '67, that could well have stirred up sediment in the tank.
Hey Clark,I got a new tank so it was definitely clean,so frustrated,I tried to do everything right and now I can’t even drive it,should have the new pump tomorrow so gonna drop the tank and try again,thanks for the response
i got MSD Atomic . it came with rubber lines. MSD say it must be used and not to use hard lines. Holley must have supplied that rubber line for a good reason.
Copper has always been a no-no, not quite sure why, but NHRA says NO copper fuel lines - must be a reason.
I'm no scientist, but I believe "work hardening" can occur in soft copper, causing it to get brittle and crack.
New fuel tank! New fuel tanks must now be flushed (probably with gasoline) and drained before installation as the tanks have an anti-rust internal coating. If not flushed, that coating, as I found out, will clog the fuel filters. With mine, I could drive the Ranchero for a few miles. Then the pump would overheat and quit. The Ranchero would then run again after the fuel pump cooled down. Changing out the fuel filters solved the problem.
Sorry guys it is a steel line,and I’ve put 30gallons of gas in it so hopefully when I drop the tank and replace the pump and filter it will be better,on its maiden voyage on Saturday it was a beast finally showing the horsepower it should have had,as always thanks for your input
Hey guys the issue was the in tank fuel regulator,Holley has had issues with them,they sent me 2 of them,the tech told me to be careful with them,that they are very flimsy!his exact words,anyways swapped it out,running great,no pulsing,when it was running terrible I had black smoke coming from the exhaust so I’m gonna replace the spark plugs,any suggestions for a good plug?390,mild cam,EFI approximately 370 hp,as always thanks for your input
I'd stick with a normal style plug, no "trick of the week" stuff, no platinum tip, just a standard Autolite (or similar) stock heat range plug. The high dollar new style plugs will not yield any improvement over the regular plugs.