Fuel Injection

[Donald Smith]

I have a SVO 351 with Holley fuel injection. It's a Holley"Pro-Jection 4" system. When I first look at the car it would not start and the problem was traced back to the elec. fule pump. The pump was replaced and the car ran fine. I bought the car brought it home and it will not start, not getting fuel to injectors. There is power to the fule pump. Before I replace the fule pump is there anything else that may be the problem?

[petek]

I'm running the same thing in my Cobra (Holley Projection 4Di, 900cfm on a 351W). Have you checked your fuel filters?

(You might also want to put a pressure gauge on the fuel lines to make sure you've got the right pressure going to the throttle body and no pressure going back to the tank.)

[Donald Smith]

Will do that, but still shouldn't the fuel pump still come on (make some noise)?

[GOCATS]

Mine is a speedpro fuel injection system, but i fmemory serves me correctly there was a line from the computer to the fuel pump to let the fuel injection know the pump is on. I have the pump wired to com on right before it hits the start slot. I think Petek is right and you should put a fuel pressure guage in to checking your pressure. What pound injectors are you running? Does you pump put out enough pressure to the injectors? Just thoughts.

J.A.

[Donald Smith]

Here what I've done so far. I pulled the fuel filter and it was full of "stuff." So here is my thinking, probably wrong. The car sat for over two years with the gas tank out of the car. After the car ran for a short while the "stuff" in the tank plugged up the fuel filert. The fuel pump ran dry (no fuel getting to it) and burned itself out. Any other idea?

[petek]

When you first turn the ignition switch to the "on" position the fuel pump relay should pull in and the fuel pump should run (for a while). With the engine not running the fuel pump will shut off after a short period of time.

I don't know enough about Holley's fuel pumps, but as a general statement, electric fuel pumps appear to often use the flow of fluid through the pump to cool the pumps.

Something you might try... disconnect the fuel pump wiring (connector at the fuel pump). Hook up a volt meter. Switch on the iginition. Are you seeing +12 volts at the connector end? If so, you know you are getting power to the pump. If no power, check the fuel pump relay or the hot wire from the fuse box to the fuel pump relay (I seem to remember that there is a separate power wire going to the fuel pump relay ... makes it easier to insert an inertia kill switch).

[Jack21]

A problem that stumped me, and stalled the car on the highway was a rust clogged fuel pickup screen on the fuel pickup in the fuel tank.

First, try blowing it out with air pressure. Do this with tank nearly empty, or you'll get fuel out the filler neck. If fuel flow returns, remove the tank sender and pickup. Either clean it real well, or replace it.

[Donald Smith]

Thanks for all the advice. What I did was pull the tank and had it professinally cleaned from top to botton and inside out. The fuel pump was shot so I bought a system with a fuel fiter placed after the tank, then the fuel pump and then a high pressure fuel filter. Will install all of that sometime this coming week. Will let you know how it all works. Crossing my fingers.

[Donald Smith]

Problem solved. I had the gas tank cleaned, got a new fuel pump and high pressure filter and installed same. Put gas in the tank, crossed my fingers, turned the key and I'll be, it started right up, although I'm not so sure the neighbors were so pleased.

[Jack21]

Follow the various sidepipe, muffler, and exhaust threads and see what folks are doing to quiet the beasts down.

Ya gotta dig into who's making what for exhaust systems, and how well they're working on Cobras.

It all started when DV and Ed Welsh cut open their stock CR factory mufflers and exclaimed, "Holy $hit, no wonder this thing isn't making any power"! The quest continues.