Lateral-g Forums - Holley Dominator EFI hard starting after warm up

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Holley Dominator EFI hard starting after warm up

Well guys on to the next problem. My car is very hard to start after warm up. It will turn over for quite some time before it starts . Cold starts are okay . Any ideas:bang: Trying to set up my laptop so I can see what's going on but that's another story .:confused18:

I'd be looking for areas where your fuel line is getting too warm. Even with fuel injection you can get heat soak. Also, look at your fuel pressure and make sure your tank is venting properly.

Vaporlocking in the rails? How is your fuel system routed. What fuel? I had zero starting issues with 93 and only a small delay when starting on E85.

Do you have a fuel pressure gauge?

Hard start can be a bit tricky. In the Holley, you have to get the air/fuel set somewhat manually with the IAC opening and startup fuel. The tables are based on CTS, and take some experimenting.

Also, the Holley has a fixed timing advance for starting. Where is that set?

Quote:

Originally Posted by Vegas69 (Post 663419)

I'd be looking for areas where your fuel line is getting too warm. Even with fuel injection you can get heat soak. Also, look at your fuel pressure and make sure your tank is venting properly.

Thanx for the info Todd I'm on it!

Quote:

Originally Posted by will69camaro (Post 663420)

Vaporlocking in the rails? How is your fuel system routed. What fuel? I had zero starting issues with 93 and only a small delay when starting on E85.

Will I'm running VP 100 I'm going to look at the routing this week.

Quote:

Originally Posted by carbuff (Post 663423)

I do have a gauge I just have to find out what the pressure should be. This Holley EFI is all new to me . Glade I have you guys!

Generally you will be at 43 or 58 psi, and there is a setting in the Holley setup which indicates what pressure you are using. If the car is running ok once started, that should all be fine. I was curious if you were getting pressure during hot start based on the vapor lock questions. I'd be surprised if that is the problem with a higher pressure style EFI pump, but I suppose it's possible...

Quote:

Originally Posted by carbuff (Post 663522)

highly doubtful.... you'd basically have to have heated up the entire tank of fuel.

Here IS a problem I've seen with EFI and the higher fuel pressures..... is when someone creates a VACUUM situation with a fitting (not pressure). Fuel boils with VACUUM... (it's not really boiling - it cavitates).

I'd be looking for a RESTRICTION in the fuel system.

Quote:

Originally Posted by DOOM (Post 663397)

I thought this car was pro built?

Is there a controller on your pump Mario -- because most fuel pumps are NOT continuous pumps.... but if they're not controlled then they turn into continuous pumps and as such get hot. Then you add heat soak - and then they start boiling the fuel... and don't pump worth a damn. That would show up on hot start.