Fuel Problem

[pbgsho]

After sitting for several years my 90 SHO will not start and has apparently developed a fuel problem since it has a spark. When the key is turned to the on position, I do not hear the fuel pump running. There is no fuel at the fuel pump pressure port. There are possibly three obvious problems.
1 Bad fuel pump
2 Fuel pump relay
3 Inertia Switch
I have removed the inertia switch and shorted the wires with no solution.
No clue where the relay is located.
My manual shows a way to bypass everything by grounding a contact on fp lead on the self test connector which will allow the pump to run when the key is turned on. Is this the same connector under the hood on the right side where I would connect my code reader?
If you have suggestions please help.

pbgsho

 

[frosho]

Yup, same connector.

The relay is in the CCRM (black box full of relays mounted to the radiator support). Give it a whack and see if that changes anything.

 

[pbgsho]

frosho, thanks for the response but I guess I am not too lucky since the pump did not run. Think I will consider the hole cutting technique to get to the pump.

pbgsho

 

[luigisho]

Make sure power is getting to the pump and not cut off at the ccrm relay. Makes it easier to figure if you need a new pump or ccrm.

 

[pbgsho]

When the fp lead is grounded in the self test connector is the CCRM relay still in the circuit? As yet I have not checked this.
Thanks,

pbgsho

 

[pbgsho]

Here is a brief update on my fuel problem. From information on an earlier post I was able to determine that the fuel pump is defective. There is continuity across the inertia switch. Using my VOM I was able to determine that there is power going through the switch since I read a momentary 10+ volts when the key is turned on. I assume that from there the power goes to the fuel pump. This would also tell me that the CCRM is ok. Is my logic correct?
Thanks,

pbgsho

 

[whiteguy3]

Correct. Replace the pump. Easiest done after you make an access door under the back seat. Do not cut it all the way off. You can find the measurements on here if you do a search.

When your done you can just bend the cut section back and cover the cuts up with duct tape or other strong tape. Then your done.

 

[luigisho]

We up in the north cut the access hole in the floor because of all the rust under the body. In FL you may not have alot of trouble dropping the tank without breaking the fasteners or the straps that hold the tank up.

 

[pbgsho]

whiteguy3, thanks for your confirming response. I can use my grinder with a thin cutting disk to make the cuts. Much quicker than dropping the tank and I will have ready access in the future.

Thanks,

pbgsho

 

[kevinspann]

Be careful not to cut through the fuel lines - they are fairly close to the floor pan.

 

[whiteguy3]

Even If I lived in FL I would still cut an access door. I don't think people do it because of rust, just because it's easier and whenever it would need to be accessed it can be.

And, those fuel lines - be careful. No need to cut in super deep.

 

[pbgsho]

The hole has been cut so my next decision is the fuel pump brand. The Walbro 526-1 is about $90.00 and does not seem to be available locally. The other choice is the Airtex Master at Autozone which is considerably cheaper. I have seen some adverse comments about the Airtex brand so what is the opinion of the group?

Thanks,

pbgsho

 

[shooff82]

Most of the older Ford fuelpumps are pretty universal. I've swapped pumps between cars and trucks without issues. I would get a housebrand pump for a fox out of Jegs or Summit. I think you can get a 155lph for about $78.

 

[AREA 91]

DO NOT BUY AN AIRTEX FUEL PUMP!!!!

They are JUNK!!!

 

[luigisho]

get the correct walbro unit

 

[frosho]

DO NOT BUY AN AIRTEX FUEL PUMP!!!!

They are JUNK!!!

Why?

I did a little research on here a while ago, and it sounded like they were fine for a stock SHO.

In regards to the Airtex E2001, it is more than adequate for a stock SHO per this email from them:

"Steve,

The flow rate for the E2001 is 30-40 GPH and has a max pressure of
80-100 P.S.I. Thank you for the inquiry.


Craig Gottfried
Tech Line Supervisor
Airtex Products
800-424-7839
Fax 618-847-8678"

IIRC, Bizzy installed one of these and has indicated she was satisfied with it.

It sells for $61.99 at my local AutoZone under the Master brand name and is normally a stocked item.

Steve

Not saying you're wrong. I'm just curious why you say that.

 

[Bob Gervais]

Why?

I did a little research on here a while ago, and it sounded like they were fine for a stock SHO.



Not saying you're wrong. I'm just curious why you say that.

I think a few bad experiences led to this generalization Matt, along with Airtex listing the wrong part number for our vehicles some time ago.

I've used Airtex (or whatever Autozone carries) pumps twice, on my former 93, and they didn't last very long.

On the flip side of things, this weekend I'll be replacing my current Walbro 155 LPH pump with the SHO-specific 526-1 Walbro. I'm getting low fuel pressure, and I'm not sure if it's the pump, or junk in the system, but if I'm dropping the tank I'm going to replace it anyway.