260 has spark, fuel, won't run

**ShadowFlier** · 04-02-2020, 01:04 PM

I'm having some problems with a new to me 260. I bought the motor as a rotating assembly. I put electronics on from a running carb motor and added an injector harness. The motor wont run unless you spray gas into the horn. I've checked timing, changed the injector harness to a new Wizard harness, changed fuel sources, pulled all injectors and verified that they are spraying. I'm not sure what I'm missing.

**FUJIMO** · 04-02-2020, 01:29 PM

r u using a fully charged battery? everything grounded?

**Mike Nass** · 04-02-2020, 01:32 PM

ECU or ECU power source is my bet... what ECU are you using?

**G-Train** · 04-02-2020, 01:40 PM

He's got an A63. Had it checked with a 4 button, and it will read it. He can try an A13 he can rob from another boat at his house to test it I guess.
Could it be the switch boxes?

**ShadowFlier** · 04-02-2020, 03:13 PM

I have the ECU power run off the ignition switch and verified that it is getting power. I also tried running it straight from the battery and no change. I changed outer switchbox to a known good one and no change. I've also verified that it is getting spark.

**ShadowFlier** · 04-02-2020, 05:24 PM

Figured the problem out. My tee for the fuel return line was too big and letting too much fuel by. I searched all over for a factory tee but couldn’t find one. Does anyone know where to get one?

**97mirage** · 04-02-2020, 06:13 PM

Are you referring to part number 11 in the diagram below? If so, here is a link: https://www.mercruiserparts.com/bam/subassembly/30687/2708/7

**Jay Smith** · 04-03-2020, 07:51 AM

I’d dial indicate the motor on All holes go to perfect TDC turning clockwise then when that is confirmed turn counter clockwise to .150” and MARK flywheel across from static pointer , advance the timing to total timing , turn over and over at full advance shoot timing light confirming spark at proper time on ALL holes best was to confirm switch box and igniting health !!
Jay @ JSRE

**Jay Smith** · 04-03-2020, 07:54 AM

You question about the RED ( reducing ) TEE its is a must to use that proper tee I bought the last 3 about a a month ago from OEM , I’d figure they would have restocked ????

Jay

**racervboat** · 04-03-2020, 09:52 AM

Originally Posted by Jay Smith

You question about the RED ( reducing ) TEE its is a must to use that proper tee I bought the last 3 about a a month ago from OEM , I’d figure they would have restocked ????

Jay

Have them on ebay for 48.00 says more than 10 available ?

**Jay Smith** · 04-03-2020, 12:16 PM

Yep the 3 I bought from Mercury was $48.00 list the warehouse he ordered from had 3 available I use them a hell of lot finding many clogged I bought a micro drill bit set thinking I could drill to speck !! WRONG I checked hole size with a known new one and the smallest bit mounted in a pin vise was to big , it that hole is drilled to big it will rob fuel rail of inventory and run motor lean ...

Been there and done that ,
Jay @ JSRE