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Oct 25, 2017 | 11:46 AM

SSjohn415

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Need help with fuel

I'm doing an ls swap into my Monte Carlo SS (86), I have a stock 07 ls2 im getting 80 psi fuel will that stop my injectors from working??? When I crank it the engine doesn't fire up, i sprayed starting fluid and the engine fired right up. I Need some help please.

Oct 25, 2017 | 04:25 PM

Crf450r420

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How is your fuel system setup in the car? What are you using to regulate the fuel pressure?

Oct 25, 2017 | 05:01 PM

SSjohn415

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Originally Posted by Crf450r420

How is your fuel system setup in the car? What are you using to regulate the fuel pressure?

I have a isr fuel regulator on a returnees system

Oct 25, 2017 | 06:09 PM

Crf450r420

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Returnless systems only work with PWM fuel pumps. EFI needs high pressure and those pumps need fuel flow to keep cool if they ran constantly.

Oct 25, 2017 | 06:19 PM

SSjohn415

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Quote:

Originally Posted by Crf450r420

Returnless systems only work with PWM fuel pumps. EFI needs high pressure and those pumps need fuel flow to keep cool if they ran constantly.

will I be ok if I tie into the return line

Oct 26, 2017 | 09:39 AM

Crf450r420

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You need to have a return. That will keep the pump flowing and cool, plus allow you to adjust the fuel pressure to more standard pressure.

Oct 26, 2017 | 10:07 AM

SSjohn415

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Quote:

Originally Posted by Crf450r420

You need to have a return. That will keep the pump flowing and cool, plus allow you to adjust the fuel pressure to more standard pressure.

I'll just uncap my return and tie end to it. So once I get the pressure right my injectors should kick on or do you think they are possibly clogged ???(I had the engine at least 6 months before I installed it)

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Oct 26, 2017 | 08:51 PM

SSjohn415

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Quote:

Originally Posted by Crf450r420

Unless junk got into them they shouldn't be clogged, but they can be stuck. A battery to each and listen for a click, if they don't tapping on them can free them up.

ok I'm on it right now

Nov 2, 2017 | 06:13 PM

#10

SSjohn415

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Quote:

Originally Posted by Crf450r420

Returnless systems only work with PWM fuel pumps. EFI needs high pressure and those pumps need fuel flow to keep cool if they ran constantly.

I connected to my return set the regulator to 60psi and it still only start with starting fluid

Nov 2, 2017 | 09:53 PM

#11

Crf450r420

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If you have fuel at rails and pressure is okay. The only things that can keep out of the motor normally would be injectors stuck or EFI computer/harness issue. Put a test light in place of the injector and crank it, light should pulse. If it pulses, just injectors with a 9 volt battery.

Nov 5, 2017 | 11:52 AM

#12

SSjohn415

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Quote:

Originally Posted by Crf450r420

when put my test light on the injector harness the comes on and at the fuse box when cranking theres' no light at all

Nov 5, 2017 | 11:58 AM

#13

SSjohn415

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Quote:

Originally Posted by Crf450r420

the hole fuel box has no power during cranking

Nov 5, 2017 | 02:29 PM

#14

G Atsma

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Sounds like during cranking, there is no power. Make sure there is power WHILE cranking AND after startup.

Nov 5, 2017 | 02:45 PM

#15

Crf450r420

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Yeah, really old cars with points you can have an issue trying to install EFI because some things don't maintain power while cranking. The ECU, injectors, fuel pump, and coils must have power while cranking. If it has power with key on then you likely have an ignition switch issue or maybe a weak relay. Oh, unless your voltage is dropping below 10 volts, sometimes it's 8 volts that is an issue, but if it stays 10 or above it's not a problem.