Fuel pump runs as soon as the battery cable is hooked up! PLEASE HELP

[mcglsr2]

I will check my FSMs tonight when I get home, and look through the wiring to see where your issue might be. Sorry, I should have done this sooner.

 

[rz5.0]

Bet the relay its done for. Allowing current to go thru all the time..

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[BigSkySN95]

Isn't the relay in the CCRM?

 

[rz5.0]

You should be able to get a. Volt meter and check

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[rz5.0]

Yes it is

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[BigSkySN95]

I changed the CCRM already and it's still happening.

 

[rz5.0]

Have pulled the fuse yet for fuel pump. See if it still happens

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[mcglsr2]

Also, just as a side question, how much HP you thinking of making anyway? That pump is HUGE. On a FI application, it will flow enough to support 800 HP. If your HP goals are less lofty, like say around 600 HP, then a drop-in 255LPH would most likely work just fine, as will your stock OEM wires. The best, of course, is to run a new, larger AWG wire. But if you just don't want to, then I have to ask - why such a huge fuel pump?

 

[BigSkySN95]

Good call! If I pull the fuse I shouldn't have to worry about frying another CCRM right?

 

[BigSkySN95]

Just figured I'd be ready for a 363 later

 

[rz5.0]

Right. Unless your problem is in the wiring on the ccrm side

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[BigSkySN95]

So for background, this car ran great when I decided to yank the nitrous and install a Vortech. At that same time I figured the 190lph pump I had in there wouldn't be adequate so I upgraded it and the 340 pump was only a few bucks more than the 255 so I figured why not

 

[rz5.0]

A single 255 will not hold 600hp with out a inline pump or boost a pump. Which both require extra wiring.. A HIGH PRESSURE 255 will do about 500..

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[rz5.0]

The 340 is a good pump.. Been running one for years.. Use stock wiring in a 95 for a while then upgraded wiring when i swapped it over to the 98..

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[rz5.0]

I would pull the fuse and ccrm.. Then get a volt meter and check the wiring. Make sure it's not grounding any were.. You should also be able to check the ccrm

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[BigSkySN95]

I've been looking at wiring diagrams so I know which wires I'm dealing with

 

[rz5.0]

There is a few places are the harness vines apart.. You could do it in sections..

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[rz5.0]

I still think it's the relay.. But just do 1 step at a time

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[mcglsr2]

The 340 is a good pump.. Been running one for years.. Use stock wiring in a 95 for a while then upgraded wiring when i swapped it over to the 98..

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Not saying it isn't a good pump. A Walbro 255 will support about 470 rwhp. On about 80 to 85% DC. I was just wondering why the OP had chosen the 340. "Because" is a perfectly acceptable answer. I was just curious.

 

[rz5.0]

Not saying it isn't a good pump. A Walbro 255 will support about 470 rwhp. On about 80 to 85% DC. I was just wondering why the OP had chosen the 340. "Because" is a perfectly acceptable answer. I was just curious.

340 has become quiet popular.. I would not use a high pressure 255 over 450 my self.. But that's just me.. I just saying the 255 would not support FI 600 hp wheel or crank..maybe NA

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