"Fuel Regulator Next?"

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Jun 27, 2009 | 11:29 PM

Harry G

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Intermediate

Joined: Sep 2005

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"Fuel Regulator Next?"

I have replaced the fuel pump on my '89. It definitely made a difference, was able to drive it again. About 2 weeks later, went to leave work and it was a bit hard to start and then got flooded. I let it sit for about an hour and got it started and drove home. When I got home, I shut it down. Smelled fuel and couldn't get it started again. Went back to the gas tank to see if there was any smell back there and there was none.

When we were diagnosising the original problem, I received advice to test the fuel regulator by removing the vacuum hose, and if the regulator was the problem, would see a jump in the pressure.

I set up the pressure gage again, got 39 PSI, then removed the vacuum line and it jumped to 49 PSI.

Is there another problem I might have? Did a volt check on the TPS and got a smooth transition from almost 0 to 5.0 volts, indicating it was probably OK.

If it is the fuel regulator, I have seen rebuild kits and new ones in catalogs. Any recommendations. Can the rebuild be done with full teardown of the fuel injection system?

Thanks in advance - Harry G

Jun 28, 2009 | 05:58 AM

floridamale

Safety Car

Joined: Jan 2008

Posts: 3,939

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From: Vero Beach Florida

Have you checked your injectors

Jun 28, 2009 | 08:03 AM

engle1147

Le Mans Master

Joined: Jul 2007

Posts: 5,043

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From: Tampa Florida

Quote:

Originally Posted by floridamale

Have you checked your injectors

89's have problematic fuel injectors.....get'em out of there.

Jun 28, 2009 | 10:32 PM

gw962

Racer

Joined: Jan 2007

Posts: 274

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From: Muskogee OK

Quote:

Originally Posted by Harry G

I have replaced the fuel pump on my '89. It definitely made a difference, was able to drive it again. About 2 weeks later, went to leave work and it was a bit hard to start and then got flooded. I let it sit for about an hour and got it started and drove home. When I got home, I shut it down. Smelled fuel and couldn't get it started again. Went back to the gas tank to see if there was any smell back there and there was none.

When we were diagnosising the original problem, I received advice to test the fuel regulator by removing the vacuum hose, and if the regulator was the problem, would see a jump in the pressure.

I set up the pressure gage again, got 39 PSI, then removed the vacuum line and it jumped to 49 PSI.
Pull the vacuum line and give it the sniff test. If you smell gas, odds are it needs to be replaced
Is there another problem I might have? Did a volt check on the TPS and got a smooth transition from almost 0 to 5.0 volts, indicating it was probably OK.
The TPS should read .54v +/- .08
If it is the fuel regulator, I have seen rebuild kits and new ones in catalogs. Any recommendations. Can the rebuild be done with full teardown of the fuel injection system?
I just replaced the diaphram in my '90 a few weeks back. You just need to pull the plenum to have access. T-10 torx for the regulator cover. Disconnect the battery and relieve fuel pressure. Also a good time to clean the TB if it hasn't been done lately.
Thanks in advance - Harry G

All in all, it's pretty simple and can be done in less than 2 hours. Good luck.

Jun 29, 2009 | 10:23 PM

Harry G

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Intermediate

Joined: Sep 2005

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Thanks, will let you know how it works out.

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