1987 Fuel Surge
Thread Starter
Racer
Joined: Apr 2011
Posts: 367
Likes: 7
From: Congupna Victoria
1987 Fuel Surge
Guys,
Has anyone experienced fuel surge (i.e. fuel moves away from the pickup in the tank) when the fuel level is 1/3 full or less?
I seem to get it as soon as fuel gets to or below 1/3 full and accelerate in a straight line.
The engine hesitates and breaks down, stumbling etc.
If its over 1/3 full, I never experience it
Interested if I'm not the only one and if anyone had modded the pickup to eliminate..
Thanks
Has anyone experienced fuel surge (i.e. fuel moves away from the pickup in the tank) when the fuel level is 1/3 full or less?
I seem to get it as soon as fuel gets to or below 1/3 full and accelerate in a straight line.
The engine hesitates and breaks down, stumbling etc.
If its over 1/3 full, I never experience it
Interested if I'm not the only one and if anyone had modded the pickup to eliminate..
Thanks
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
While drag racing I always arrived with 1/4-1/3 tank and had no issues even below 1/4 tank while pulling mid-1.8s short time.
I wonder if your pickup assy. has been distorted to not reach low enough.
I wonder if your pickup assy. has been distorted to not reach low enough.
Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
Thread Starter
Racer
Joined: Apr 2011
Posts: 367
Likes: 7
From: Congupna Victoria
Just to finish this off - I know it's taken a while.
But with the Callaway TT, there were two additional injectors added for increased fuel that the turbos necessitated.
Anyway, the injectors were clogged up and almost completely blocked.
Cleaned them up and all is good!
I had cleaned the 8 on the engine previously, BUT not these additional two.
Problem solved!
But with the Callaway TT, there were two additional injectors added for increased fuel that the turbos necessitated.
Anyway, the injectors were clogged up and almost completely blocked.
Cleaned them up and all is good!
I had cleaned the 8 on the engine previously, BUT not these additional two.
Problem solved!
Last edited by puzzigully; Nov 1, 2019 at 12:23 AM.
Former Vendor
Joined: May 2001
Posts: 6,125
Likes: 739
From: Callaway Cars - Old Lyme, Connecticut
On the Callaway, one is to operate with at least 1/8 tank of fuel, always. You may experience fuel pick up problems at or below this level. Something other than what you had, but wanted mention, also.
Thread Starter
Racer
Joined: Apr 2011
Posts: 367
Likes: 7
From: Congupna Victoria
Thanks Chris,
important information!
My issues were with (not surprisingly) tanks that were at least 1/2 full or more - but I'm thinking the tank level had very little to do with it now.
The condition of the injectors was pretty poor - amazing ANY fuel could get through!
As a matter of interest, do you know (generally speaking) if the two additional injectors add fuel all the time, or just at certain rpm/load/throttle position?
Thanks
important information!
My issues were with (not surprisingly) tanks that were at least 1/2 full or more - but I'm thinking the tank level had very little to do with it now.
The condition of the injectors was pretty poor - amazing ANY fuel could get through!
As a matter of interest, do you know (generally speaking) if the two additional injectors add fuel all the time, or just at certain rpm/load/throttle position?
Thanks
Former Vendor
Joined: May 2001
Posts: 6,125
Likes: 739
From: Callaway Cars - Old Lyme, Connecticut
The two addl. injectors only fire when under positive manifold pressure. So they are at rest, other times.
Even though the 87-88 injectors were different than the notorious 89-91 RP (Rochester Products) injectors, all benefit from replacement with a modern injector. I like the Delphi Injectors from FIC. Here's what I've been using in my own cars, and for customer suggestions:
https://fuelinjectorconnection.com/c...l-injector-set
Looks like they have a sale which may expire today.
Even though the 87-88 injectors were different than the notorious 89-91 RP (Rochester Products) injectors, all benefit from replacement with a modern injector. I like the Delphi Injectors from FIC. Here's what I've been using in my own cars, and for customer suggestions:
https://fuelinjectorconnection.com/c...l-injector-set
Looks like they have a sale which may expire today.
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Team Owner
Joined: Jul 2004
Posts: 28,474
Likes: 3,291
From: Hartford WI
I didn't detect anything resembling a slosh. I think it is because I have the baffle. Now if it were a race situation, I probably will want a tank with a purpose built baffle instead of the stock one. I always run till it is at empty and past reserve.
Team Owner
Joined: Aug 1999
Posts: 24,017
Likes: 634
St. Jude Donor '10
My Callaway TT needed a 1/4 of of tank. With almost 600rwtq...1st and 2nd gear(if I hooked) would move the fuel away from the pickup enough to make the engine lay down.
Former Vendor
Joined: May 2001
Posts: 6,125
Likes: 739
From: Callaway Cars - Old Lyme, Connecticut
Use the 22lb Delphi injectors in the link - ON SALE NOW at FIC in the link provided. 20% discount.
The front two injectors have never gone bad in any cars I have seen. They should be fine.