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Update just in case anyone cares, it was the fuel lines. I added a 155lph pump and still had problems, I ordered new lines and a new pro m bracket with return line goes to the bottom of tank and bam! It runs perfect and flawless, I updated complete system with all new 3/8 feed and return...

No codes I have the pro m efi system it's all obd2 now. The codes are clear till the running lean condition starts then I get lean on bank 1 and bank 2. No charcoal canister or purge valve or emissions at all on the engine. I do have a larger fuel tank vent (rollover) breeze I believe it's...

I will try a 155lph pump to see the difference it will make if any, would be nice if y'all could all see what I'm seeing while its idling. I know the return line is to high on the pump bracket, I understand that will make it aerate when tank is low because of the spraying on top of fuel, but...

Tank sorry

Correct and I have stank that has a different baffle system made by Glenn's performance. The 45 minutes is how long it takes before the fuel really starts bubbling in the tank. With 10 to 13 gallons it takes 45 minutes at idle, with 5 gallons maybe seconds at idle. The car won't even make it...

Mine loses fuel pressure under light revving after it has run for 45 minutes. Also the gauge stays twitching all the time after 45 minutes

It's not causing tfi to go out, I said it was the same symptoms as a tfi. I know a lot of people that haven't had any problems too. That's why I'm trying to figure out why is it just my car. But it's either boiling fuel or aerating it when running.

Im going to try that first i will order a 155lph tonight, as for symptoms i have two a/f gauges and after 45 minutes of idle with 3/4 tank i start running lean on river bank the passenger bank. The car starts to detonate and and will not idle, or rev. Its similar to a tfi failure. If you let...

i should be around 350hp i believe, not sure car wont run long enough to dyno with the fuel problem tfs1, cam afr 124s, edlebrock performer, 30 lb inj, bbk shorties, 306, scat rotating

My buddy has the same setup as me without the efi system and he hasnt had any problems. I wonder if there is something different between the 88 and 93 cars. One thing we did notice on his when we changed his heads was he had a lot of carbon on top of his pistons. Couple of forums I have read...

Since I used the pro efi setup the tfi has been eliminated, so thats been a big help. I'm just having a hard time unloading my wallet on the fuel lines, Its just been strange the way the car was before and now. I can see the fuel bubbling in the tank and i can put the feed line and pump in one...

Ok, so for the last two years me and a buddy of mine have completely tore down a 1988 mustang gt and rebuilt for autocross. We did the engine, suspension, and complete inside. After it was all done I started driving it and found that i would keep losing tfi modules. Well I got sick of that...

I'm using scorpion 1.6 roller rockers pedestal mount.

I rotated the engine all the way to the flat spot on the cam.

That's what I was thinking, I may go that direction next. I need to pull the intake anyway, have a stripped hole to repair. While I'm in there I will change the lifters

Need some help, I have had issues with my valve train. It's been ticking, so I pulled the valve covers and found the pushrods were to short. I used a pushrod length checker and found that the ones in it were 6.243", the checker had me at 6.252. I ordered 6.272, I installed them and they still...

As for the FRP I want to eventually put a small blower on it.

There cast iron gt40 heads, not sure on rockers. Will be pulling the valve covers off soon to get a idea. It sounds like a ticking noise, the guy I bought the car from told me that the engine builder said the push rods were just a smidgen to short.

Hey new on here, just bought my second mustang. Picked up a 88 gt, has been updated with a 306,gt40 upper gt 40 lower, comp cam 270, bbk headers, bbk throttle body, and I believe original maf. Has 24lb injectors and 255lph fuel pump, this info came from the guy who built it. Couple of...

Hey, I'm new here and need some advice. I have a 88 gt that has a new 306 using gt 40 heads intake upper and lower bbk headers, BBk throttle body and I believe the factory mass air meter. Has a comp cam too, not sure the lift nor duration. Runs pretty strong, I don't think it's been tuned...